Barriers to Competition and Productivity: Evidence from India
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- Ambrose Gibson
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1 Barriers to Competition and Productivity: Evidence from India Jagadeesh Sivadasan Revised June 2009 Abstract A number of economic theories suggest that barriers to competition lead to higher levels of inefficiency among incumbents in an industry. In this paper, we use a detailed plantlevel dataset to study the the impact on productivity of two reforms aimed at increasing product market competition in India liberalization of foreign direct investment (FDI) and reduction in tariff rates initiated in First, we examine the effect of the liberalization policies on mean plant-level productivity in the liberalized industries. While we find no significant effects in the short-run ( ), we find significant increases in productivity level in the FDI and tariff liberalized relative to non-liberalized industries in the longer term ( ). We check and find our results robust to a range of robustness tests. Next, we examine the role of intensive (within-plant productivity growth) and extensive (reallocation from less to more productive plants) margins in the post reform productivity increases, and find a predominant role for the former. Finally we assess potential channels for within-firm productivity improvement. Consistent with a role for price competition, we find evidence of relatively greater output price declines in the liberalized sectors. Keywords: Competition, Efficiency, Firm Performance, Foreign Direct Investment, Trade Liberalization, Industrial Policy. JEL: D24, O47, F13, F14 I thank the editor and three anonymous referees for comments and suggestions. I also thank Sam Peltzman, Marianne Bertrand, James Levinsohn, Amil Petrin for detailed inputs, and Bo Becker, Jeremy Fox, David Levine, Randall Krozner, Chad Syverson, Lan Shi, Natarajan Balasubramanian, Guy David and participants at Applied Economics Seminar at the University of Chicago and seminar participants at Berkeley, Wharton and the University of Michigan for their comments. Any remaining errors are my own. Research support from the Sanford J. Grossman Fellowship in Honor of Arnold Zellner is gratefully acknowledged; any opinions expressed herein are the author s and not necessarily those of Sanford J. Grossman or Arnold Zellner. Address: Stephen M Ross School of Business, University of Michigan, 701 Tappan Street, Ann Arbor, MI Ph: (734) ; jagadees@umich.edu. 1
2 1 Introduction Do lowering barriers to competition improve corporate efficiency? While some theoretical papers point to potential negative consequences of competition for efficiency (e.g., Scharfstein (1988)), 1 the prevailing view among economists support a positive effect of competition on efficiency (Nickell, 1996). A well-known quote by Adam Smith, that monopoly...is the enemy of good management (1976, bk 1, p 165, cited in Vickers (1994) and Nickell (1996)) encapsulates this view. 2 Even Schumpeter (1942), who proposed that market power may be necessary for innovation, stressed the role of potential entry, as he argued that competition from innovative entrants is an ever-present threat that disciplines before it attacks. Industrial policy in India protected incumbents from the potential disciplining effect of competition, by imposing various regulatory barriers to entry. Structural reform measures introduced in India in 1991 reduced these barriers in significant ways. Two of these reforms reduced barriers to competition for selected industries. 3 One, the government removed restrictions on foreign direct investment (FDI) into certain sectors, effectively removing barriers to entry for foreign companies wishing to enter these sectors. Two, the government lowered tariffs across the board, with some industries seeing much higher drops than others, lowering barriers to entry by foreign goods. While these liberalizations were not ideal policy experiments, the variation in the extent of liberalization across industries provides an excellent opportunity to use micro-data to evaluate the impact of lowering barriers to competition on plant-level productivity. 4 In the first part of the paper, we evaluate the impact of the reforms on the average plantlevel total factor productivity in the targeted industries. Our results indicate little to no impact of the reforms in the short run (i.e. in the compared to ). However, over the longer term ( ), we find an increase in log productivity levels following both the FDI and tariff liberalizations. Comparing mean (value-added) log productivity levels in to levels in , we find an increase of log points for plants in FDI liberalized industries and of about for plants in top third of tariff liberalized industries, which is about Raith s (2003) model predicts better incentives if competition increases in the form of greater product substitutability or larger market size, and worse incentives if there is a reduction in entry costs. 2 Nickell (1996) also cites Richard Caves (1980, p88) who noted that economists have a vague suspicion that competition is the enemy of sloth. 3 The government also effectively ended licensing requirements for manufacturing firms. This reform was pervasive, affecting almost all industries. Hence the effect of these reforms are difficult to isolate from other macroeconomic shocks. 4 We address the non-random selection of industries in Section. 2
3 and 0.45 of the standard deviation of log productivity in the overall sample. 5 We perform a three types of robustness checks on our results. First, we address potential concerns arising from the methodology used estimate productivity. While our baseline estimation procedure uses a modification of the Levinsohn-Petrin (2003) approach to control for endogeneity of inputs, this approach rests on a number of assumptions which may not hold in our context. We find our results to be robust to a range of alternative definitions of total factor productivity. 6 Second, we check robustness to alternative measures of tariff liberalization. Tariffs were liberalized across all sectors over each of the years, with the major relaxation beginning in We have detailed data on tariffs for 1990, 1992 and In the baseline analysis, we use a dummy variable to define a tariff-liberalized sector as those in the top one-third of the drop in tariffs between 1990 and As robustness checks, we use a number of alternative measures, included actual tariff changes based on interpolated measures for each of the years. for tariff liberalization. We find the results qualitatively similar across alternative measures. Third, we address potential bias arising from the targeted nature of the reforms. While our difference-in-differences approach controls for industry fixed effects and macroeconomic shocks, the selective application of FDI and tariff liberalization could lead to bias due to other reasons. We consider four possible sources of bias, arising from the selective liberalization of: (a) industries with strong pre-reform growth in productivity that may simply be continuing on a pre-reform trend; (b) export-oriented industries that may have benefitted currency depreciation; (c) capital intensive sectors that may have benefitted from liberalization of capital imports; and (d) industries relatively farther away from the frontier that may have had a greater (or lower) scope for improvement. To try to control for these biases, we redo our analysis conditioning out the effect of variables that proxy for each of these four sources of bias. We find both the FDI and tariff liberalization effects is robust to the inclusion of these controls, with a slight decline in the measured effects to and log points for respectively. In the second part of the paper, we examine the role of reallocation in the period following the reform. The theoretical literature on the effects of competition on productivity suggests two broad channels through which aggregate productivity could be increased following an increase in competition. In models of equilibrium with heterogenous firms (e.g. Hopenhayn 1992, 5 Note that this translates to an increase of about 9.3% and 14.4% in log productivity in gross output terms following FDI and tariff liberalization respectively. Log productivity change in value added terms (dω V ) is related to log productivity change in gross output terms (dω) as: dω V dω = 1 γs m where γ is returns to scale and S m is the share of material in total revenue (Rotemberg and Woodford 1995). In our case, assuming constant returns to scale and a material share of 0.75 (the mean material share in our sample), we get log productivity change in gross output terms to be the about one fourth of the value added log productivity change. This is confirmed by our results for the gross output production function in Table 4. 6 Incidentally, consistent with our findings here, Van Biesebroeck (2003) investigates alternative productivity estimation methodologies and finds that many interesting results on productivity change are robust to the choice of methodology. 3
4 Melitz 2003), lowering the cost of entry or substitutability leads to gains through re-allocation, as inefficient firms are forced to exit and resources get reallocated to more productive firms. Models that use a representative firm framework, competition leads to improvements for all firms, e.g due to reduction in slack as in Schmidt 1997, or due to stronger incentives in Raith Both these channels would lead to the increase in average productivity documented above. To delineate the relative importance of these two broad channels, we use a decomposition adapted from Olley and Pakes (1996) to estimate the contribution of reallocation to changes in aggregate productivity growth between the period and the pre-reform period. We find a difference-in-differences increase in mean industry-level aggregate productivity growth rate of 22% (58.7%) following FDI (tariff) liberalization (in the period compared to the pre-reform period). The growth of average plant productivity was the single largest contributor to increase in aggregate productivity growth, contributing 25.2% in FDI liberalized industries and about 54.9% in tariff liberalized industries. The intra-industry reallocation term in our decomposition plays only a small role in the change in aggregate productivity between the and pre-reform periods. This suggests that channels stressed in homogenous firm theories (such as better incentives to reduce slack or adopt new technologies), may have played a more important role in postliberalization improvements in aggregate productivity growth. As a more direct test of channels stressed in heterogenous firm models, we examined changes across different quantiles of the distribution, as well as various measures of the dispersion of productivity. These models imply a decline in the dispersion of productivity. We found large and significant increases both at the lower as well as higher ends of the productivity distribution following the reforms. While there were larger gains at the lower end of the distribution, the implied decrease in dispersion was not statistically significant in most cases. Finally, we discuss potential channels through which competition could lead to intra-plant productivity improvements. While data limitations prevent us from cleanly identifying the contributions of specific channels suggested in the literature, we can use data on prices and margins to evaluate a key pathway. 7 If the productivity improvements arose from increased competition induced by the reforms, we should expect this to reflect in the changes in price indices. In particular, we expect stronger declines in output prices in the reformed industries. Also price competition should offset gains from productivity improvements, so that profit margins should not increase in proportion to the productivity change. Consistent with increased price competition, we find larger declines in output price indices than in input prices. Consequently, despite the documented increases in productivity, we find moderate decline in the profit margins in the reformed industries. 8 7 We thank one of the referees for suggesting this analysis. 8 This finding on prices ameliorates a potential concern about the productivity results that it could be driven by increased demand and consequent increases in capacity utilization. The decline in prices and margins suggest that higher demand is not the driver of the productivity results. 4
5 Our paper is related to the literatures on competition and productivity, trade and productivity, and FDI on productivity, reviewed in more detail in Section 3. Our findings of a positive effect of trade liberalization on productivity is consistent with recent studies of the effect of reduction in trade barriers on productivity in the US manufacturing sector (Bernard, Jensen and Schott, 2006) and with Topalova (2004) who documented productivity improvements in listed Indian firms following tariff liberalization. The rest of this paper is organized as follows. In the next section, we describe the key Indian reforms, and define the key liberalization (dummy) variables. The third section briefly reviews related literature. We describe our data in section four. In section five, we analyze mean intra-plant productivity levels. Section six looks at aggregate output and productivity growth. Section eight discusses our results and concludes. 2 The Indian reforms Significant reforms were introduced in 1991 that transitioned India from a closed, socialist economy to a more open, free-market oriented system. The proximate cause for the reforms was a severe balance of payments (BOP) crisis in The origin of the crisis was a rapid increase in India s external debt, which coupled with political uncertainty led international credit rating agencies to lower India s debt rating. This made borrowing in international markets difficult and triggered an outflow of foreign currency deposits by non-resident Indians. The collapse of the Soviet Union and other eastern bloc trading partners, and the spike in oil prices following the Gulf war, worsened the BOP situation. The Gulf war also led to a reduction in repatriation from expatriate workers (an important source of foreign exchange at that time). These developments brought India to the brink of defaulting on its debt obligations. In June 1991 a new government came into power following mid-term elections; this government obtained funding from the international financial institutions (the IMF, the World Bank and The Asian Development Bank) and initiated a structural adjustment programme on the advice of these institutions. In terms of overall macroeconomic trends, the reforms coincided with a downturn in real output growth (see Figure I). Underlying the policy shift was also a realization that the existing import-substitution and FDI unfriendly policies had resulted in a relatively inefficient manufacturing sector with limited ability to compete in international markets. Accordingly, the key stated goals of the trade and investment reforms were to: (1) put emphasis on modernization of plants plants and equipment through liberalized imports of capital goods and technology; (2) expose the Indian industry to competition by gradually reducing the import restrictions and tariffs; and (3) assign a greater role to multi-national fims in the promotion of manufactured exports. In this paper, we focus on the following specific changes in foreign direct investment and trade policies initiated in July 1991: 9 9 For a more extensive discussion of these and other reforms initiated in 1991 and continued through the 90s, refer to Acharya (2002). 5
6 Foreign direct investment liberalization: Prior to 1991, under the Foreign Exchange Regulation Act (1973), various constraints were imposed on foreign companies operating in India. Foreign ownership rates were restricted to below 40% in most industries. In addition, restrictions were placed on the use of foreign brand names, on remittances of dividends abroad and on the proportion of local content in output (under the Phased Manufacturing Program). In 1991, foreign direct investors were allowed up to 51% equity stakes in certain industries (listed in Annexure III of the Statement of Industrial Policy in 1991), under the automatic approval route. Further, restrictions relating to use of foreign brands, remittances of dividend and local content were relaxed. Following these reforms, there was a significant increase in amount of foreign direct investment into India (see Figure II). To study the effect of lowered entry barriers to foreign investment, we focus on Annexure III industries where ownership of 51% was allowed under the automatic route. These were the sectors into which the government tried to channel foreign investment, and our analysis of aggregate sector-wise data on foreign investment proposals approved during August 1991 to December 1994 suggests that 80% of all approved foreign direct investment in the manufacturing sector in the period August 1991 to 1994 was in these Annexure III industries. 10 We define a dummy equal to one for 4 digit industries where FDI was allowed up to 51% (under the automatic approval route) to proxy for FDI liberalization. Hereafter, the terms FDI treated or FDI liberalized refer to plants (industries) where this dummy equals one. In section 5.4, we check the sensitivity of our results to a more liberal definition of FDI liberalization. Tariff liberalization: Tariff rates were reduced across the board in the early 90s. The rates dropped from an (unweighted over NIC 4-digit industries) average of about 100% in 1990 to about 64% in 1992, and to 41% by We have detailed (HS 6 digit code) data on tariffs (available from the World Bank s WITS database), matched to the NIC 4-digit industry classification code (used in the Indian establishment level data), for the years 1990, 1992 and In the basecase, to study the impact of tariff liberalization, we define as tariff liberalized (or tariff treated ) those industries that experienced the steepest declines in tariff rates; specifically, we define a tariff liberalization dummy equal to one for observations belonging to the top one-third of the tariff drop between 1990 and 1992 (i.e top one third of (Tariff 92 Tariff 90 ). Note that there was also a devaluation of the rupee by about 41% during the calender year 1991 (from about Rs 18.4/$ to about Rs 25.8/$), which counteracted the effect of the tariff reductions on import-competing industries, and gave a boost for firms in export-oriented industries. The establishments 10 The Annexure III industries evolved from a list that was originally Appendix 1 of the Industrial Licensing Policy of This Appendix 1 was a list of Core Industries introduced to limit the investment activity of large Indian companies and all foreign companies. This list was expanded under the Industrial Licensing Policy of 1973 and again in
7 in the top one-third of the tariff decline distributions experienced tariff drops ranging from 124.7% to 37.9%. Thus, we expect our dummy variable to capture broadly the segment of plants that faced the largest increase in competitive pressure from imports, adjusting for the devaluation in the currency. The use of a dummy variable to identify industries facing the largest declines in tariffs early in the reforms helps us in interpretation of various effects identified in later analysis. Nevertheless, in Section 5.4, we present the results from using a number of alternative measures of tariff liberalization, including continuous measures of declines in actual and interpolated tariff rates. In Table 1, we list the largest (by number of plants) industries in each of the three regimes. About 28.6% of the plants belong to FDI liberalized industries, and by construction one-third of the plants belong to sectors we define as tariff liberalized. There is a little overlap between FDI and tariff liberalization dummies about about 7.6% of the plants belong to industries that are both FDI and tariff liberalized under our definition. This low overlap is significant, as it implies that different industries were targeted for FDI and tariff liberalizations, and helps us to separately identify the effects of the two reforms. Even though the overlap is small, in order to separate out the effects of the two reforms, we shall focus on specifications where both FDI and tariff reform dummies, as well as interaction of both dummies are included. In 1991 the government also initiated other widespread reforms. One big reform was the extensive liberalization of licensing requirements for establishing and expanding capacity, a cornerstone of the pre-91 industrial regulatory regime (which came to be called the licence raj ). While the major part of the de-licensing reforms were initiated in 1991, some industries were de-licensed earlier. In Section 7.3, we control specifically for the delicensing reforms. Other pro-market macroeconomic policies initiated in 1991 included moves to reduce the fiscal deficit, liberalization of technology and capital goods imports, devaluation of the local currency, transition to a market determined exchange rate and liberalization of capital markets. Since these reforms were pervasive and announced simultaneously, their effects are controlled for by the year dummies in our difference-in-differences specifications. Our results may be biased if our key identifying assumption that other pervasive reforms had the same effect on the FDI and tariff liberalized industries as they had on the non-liberalized sectors, does not hold. Further, the non-random selection of industries for liberalization could lead to biased estimates of the effects of the reforms. In section 5.5, we try to control for the possible differential impact of some of the concurrent reforms (such as devaluation and liberalization of capital goods imports) on particular industries, and for other potential biases introduced by non-random selection into liberalization regimes. 7
8 3 Related literature Theoretical papers have argued for both a positive as well as negative impact of lowering barriers to competition on productivity. In models of industry equilibrium with heterogenous firms (e.g Hopenhayn 1992, Melitz 2003), lowering could improve productivity since higher entry costs (protection) allows inefficient firms to survive. Lowering barriers to entry could provide incentives (through increased competition) to cut slack (e.g., Schmidt 1997) or adopt new technologies (e.g. Aghion et al 1999). In the context of tariff liberalization, trade could provide new channels of knowledge transmission (Grossman and Helpman 1991). Arguments for a positive effect of protection include providing greater incentives for marginal cost reductions (e.g. Rodrik 1992), providing incentives for high-tech activities where learning-by-doing is important (Grossman and Helpman 1991), or providing better incentives (by reducing competition) to cut slack (Scharfstein 1988) or adopt new technologies (Aghion and Howitt 1992). Thus the net effect of lowering protective barriers on productivity is an empirical question. 11 This paper contributes to different streams of empirical literatures that relate to this question. First, our paper contributes to the literature that examines the impact of competition on efficiency. Some recent prominent contributions include Nickell (1996), Galdón-Sánchez and Schmitz (2002), Schmitz (2005), and Syverson (2004a and 2004b). To the extent that one of the main effects of deregulation is to enhance competition, the vast literature on deregulation and productivity (e.g. Olley and Pakes (1996), Fabrizio, Rose and Wolfram (2007)) is also related to this work. Most of this work finds a positive relation between competitive pressures and productivity. Second, the work here is related to broader work on the effect of FDI and productivity. The literature examining the effect of FDI on productivity has generally focused on identifying the relative productivity of foreign firms and on evaluating whether there are spillovers from foreign firms to local firms (e.g. Aitken and Harrison 1999). We focus here on the effect of FDI liberalization on all plants; irrespective of the sign of the spillover effect, liberalization of FDI regulations could affect productivity even without actual entry by foreign firms. The reduction in entry barriers to multi-national companies could force incumbents to cut slack or adopt newer technologies. The targeted nature of FDI liberalization in India permits us to try to identify the direct effect of a reduction in barriers to FDI on productivity. Third, we contribute to the empirical literature on trade liberalization and productivity. Because the extent of tariff liberalization varied across sectors, and because we have detailed establishment level data both before and after the reforms, we are able to adopt a differencein-differences approach that improves on some of the early studies. Also, we address the issue of simultaneity bias while estimating production functions (Pavcnik 2002) In Raith s (2003) model, increased competition in the former of greater substitutability and larger market size increases incentives for effort, but lower sunk costs of entry reduces optimal effort. 12 More recent studies, such as Pavcnik (2002), Topalova (2004) and Fernandes (2003) also use difference-indifferences methodologies that address the drawbacks in the earlier literature highlighted in surveys by Tybout (2001) and Epifani (2003). 8
9 Our paper is also related to studies of the Indian reforms introduced in Early studies of generally focused on a few selected industries and come to contrasting conclusions of the effect of trade reform on productivity (e.g. Krishna and Mitra (1998) find a positive effect of trade liberalization, while Balakrishnan et al (2000) find a negative effect; see review by Epifani (2003)). These studies examine before-after effects that are potentially confounded by macro-economic shocks. Two recent studies that carefully examine liberalization in India are Topalova s (2004) study of tariff liberalization and Aghion, et al (2005) study of entry liberalization. Aghion, et al (2005) use industry aggregate data and find that entry liberalization had a greater positive impact on industries closer to the technology frontier and industries in states with more flexible labor regulations. Topalova (2004) uses a dataset of medium and large firms over the to examine the effect of trade liberalization and finds a positive effect of tariff reductions on productivity. More recent work looks at other aspects of Indian reforms. Chari (2008) finds evidence for productivity gains following de-licensing reforms in the 1980s using a structural approach. Aghion et al (2008) find that the effects of de-licensing on firm growth were more pronounced in states which had more flexible labor regulations. Goldberg et al (2008a) find that product switching did not play an important role in India following tariff liberalization, as there is much less dropping of products by firms. Goldberg et al (2008b) finds substantial gains from trade in India through access to new imported inputs. We contribute to this literature in the following ways. One, we using micro data on a very large and comprehensive sample of establishments which provides some advantages. Our data covers all establishments employing more than 20 workers (not only listed firms, that are generally much larger). Also, the data we use includes figures on white and blue collar employment, and hence avoids potential biases from using labor expenditure as a proxy for labor input. 13 Two, unlike previous work, we also focus closely on the effects of FDI liberalization in addition to tariff liberalization. 14 Three, we document the importance of within-firm channel relative to that of reallocation for aggregate productivity change. Finally, by examining the effects on prices and margins, we provide evidence for first order effects of competition, clarifying a channel through which lowered barriers affect firms and potentially drive them to improve productivity. 4 Data The primary data source for this study is the Annual Survey of Industries (ASI), undertaken by the Central Statistical Organization (CSO), a department in the Ministry of Statistics and Programme Implementation, Government of India. The ASI covers all industrial units (called Factories ) registered under the Factories Act 13 For example if liberalization leads to reduction in wages, using labor costs could bias productivity upwards. 14 In one of her table, Topalova (2007) also finds evidence for positive effects for FDI liberalization in some specifications. 9
10 employing more than 20 persons. The ASI frame comprises all the factories registered with the Chief Inspector of Factories in each state. Manufacturing activity undertaken in the informal sector (households (own-account) and unregistered workshops) are not covered by the ASI. Like other low income countries, India had a large fraction of employment in the informal sector; according to estimates in Subrahmanya (2003), the employment share of the formal manufacturing sector was about 21.6% in The ASI frame is classified into two sectors: the census sector and the sample sector. Factories employing more than 100 workers constitute the census sector. Roughly one third of the units in the sample sector are enumerated every year (changed from a sampling rate of one-half in ). Since unit level data on electronic media has only recently become available to researchers, the unit-level ASI data has been used rarely used in empirical studies. Previous research using the ASI data has generally been confined to state or industry level aggregates (e.g., Besley and Burgess, 2004). Certain limitations of the ASI data have been highlighted in the literature. Pradhan and Saluja (1998) conclude that the ASI provides fairly reliable data on organized manufacturing activity, but with a considerable time-lag. Nagaraj (1999) highlights three other shortcomings of the ASI data: (i) incomplete coverage of factories, (ii) under-reporting of workers in factories covered, especially in small factories, and (iii) under-reporting of value added. He indicates that the underreporting may have increased over time. Fortunately, the questions we address and the difference-in-differences approach we use limit the effects of these shortcomings in the data. The lag in reporting the data does not affect us as we are looking at historical data. The under-reporting issues highlighted by Nagaraj do not bias our differencein-differences estimates, under the reasonable assumption that the pattern of under-reporting does not change across the liberalized and non-liberalized groups. In addition to the ASI, we use various other sources of data on the Indian economy. Data on the sectors liberalized for FDI investment was obtained from the Handbook of Industrial Policy and Statistics issued by the Office of the Economic Advisor, Ministry of Industry, Government of India. Data on tariff rates were obtained from the World Bank Trade and Production database. Other data sources used include the annual Economic Surveys published by the Ministry of Finance, the annual Statistical Abstracts of India published by the CSO, and data from various government websites. The ASI dataset and the data collected from other sources were collated and cross-indexed using different concordance tables. Many variables in the ASI dataset had to be standardized for consistency across the years. A detailed data appendix describing the ASI dataset and the various steps undertaken to clean the data is available on request from the author. We obtained unit level ASI data for the nine-year period from to from the CSO. The data is reported on a financial year basis: e.g., the year refers to the period April 1, 1986 to March 31, (Hereafter we refer to year as 1987 and so on.) There are about 50,000 plants in every year, yielding about 450,000 firm-year observations for the full dataset. For our analysis, we restrict attention to industries strictly 10
11 in the manufacturing sector. 15 We exclude extremely small plants (number of employees 5 or less), as the data on these plants appear to be noisy. This set of small plants constitutes about 3.75% of the manufacturing sector plants, but represents only 0.06% of total output (and 0.19% of employment and about 0.91% of total capital). Further, observations for which real value added, real capital and the labor variables are less than or equal to zero are excluded from our analysis, because we use logged values of these variables. White collar labor is equal to zero for a very few cases (0.32% of the total). The constructed real capital variable is less than zero for 2.5% of the plants. There are larger number of cases where real value added is less than or equal to zero (14.4% of plants), with these firms contributing about 10.5% of capital and about 10% of employment. The distribution of excluded data over different industries and over time, suggests that our analysis is not severely affected on this account (see discussion in footnote 24 in section 5.3). Finally, since we wish to focus on difference-in-differences estimates, we drop observations corresponding to four digit NIC (1987) industries that appear only for a few years, either fully in the pre-reform period or wholly in the post reform period. 16 The basic characteristics of the subset of the ASI dataset used for our analysis are summarized in Table 2(a). As discussed earlier, different segments of the population are sampled using different sampling frequencies, reflected in the multipliers (inverse of sampling frequencies). About half the observations correspond to a multiplier of 3 (2 in year 1987) and about half belong to the census sector (multiplier of 1). There are on average approximately 37,500 plants in each year, corresponding to a population size of about 71,000 plants. Note that the sampling scheme changed in 1987, as reflected in the distribution of the multipliers. In all our analysis, we appropriately weight observations using the multiplier to adjust for the sampling frequencies. The summary statistics our key variables are presented in Table 2(b) (the definitions of these variables are discussed below). Most variables are highly skewed, leading to a large divergence between median and mean values. Since we use logged values or percentage changes in the variables in our analysis, our results are not significantly affected by the skewness in the distribution of these level variables. Nevertheless, we check the robustness of our results to dropping outlying observations. A particular point to note is the high variance in the baseline TFP measure, which has a standard deviation of 1.29 log points in the full sample. Real value added is measured as the difference between real output and real values of intermediate inputs (including materials, fuels, and other intermediate inputs and services). Real output is obtained by deflating nominal output using the relevant wholesale price index (WPI). Intermediate input deflators were constructed for each industry using industry-wise 15 The survey includes establishments in some service sectors related to manufacturing, mainly general repair services, which we exclude. We also exclude the electricity generation and distribution sector. We include the repair of capital goods which is classified as a manufacturing activity. 16 This eliminates only about 1.52% of the plants, but reduces the number of distinct 4 digit industry clusters from about 850 to about 475. Because we include industry fixed effects in almost all our specifications, our results are largely unaffected by the exclusion of these plants. 11
12 WPI and the input-output table from the World Bank s Trade and Production database. Labor is measured as the number of employees. Blue collar labor is all production workers, while white collar labor is measured as total number of employees less the number of production workers. The dataset provides information on the opening and closing capital for each plant. However these are historical accounting numbers that are unlikely to conform to the economic notion of capital. We arrive at the real capital stock for each plant using a two-step procedure. 17 First, we start with the reported capital numbers for 1987, and use the reported nominal investment data to construct a real capital series at the industry (NIC 4 digit) level using the perpetual-inventory method. We get real capital stock K j,t for industry j in period t from the capital stock in the previous period K j,t 1 and the real investment in the current period I j,t, using: K j,t = (1 δ)k j,t 1 + I j,t. We use a depreciation rate (δ) of 10% (based on rates used in the literature). The nominal investment values are deflated using the WPI for plant and machinery. Next, we form the capital stock deflator for each industry as the ratio of aggregate real capital stock to the aggregate nominal capital stock. The real capital stock for each plant is then obtained by deflating the nominal stock variable using the constructed capital stock deflator (as in Harrison (1994)). To capture productivity gains (losses) from decreases (increases) in inventory, we add real value of inventory to the real capital stock variable. The definitions of liberalization variables used in our analysis are explained in detail in Section 2. As discussed there, the list of FDI liberalized sectors is provided in the Annexure III to the Statement of Industrial Policy of This list was manually matched to the NIC (1987) 4-digit codes based on a careful review of the industry definitions. Data on tariff liberalization is obtained from the World Bank s WITS database for 1990, 1992 and 1996, at the 6 digit HS code level. We developed a concordance between the HS code and the NIC (1987) 4-digit code using intermediate concordances between the HS code and product item codes used by Indian statistical authorities and a crosswalk between the product item codes and the NIC (1987) 4-digit code constructed using Indian establishment level data for Alternative measures for tariff liberalization are defined in section Effect on average plant-level productivity In this section, we analyze the effects of product market reforms (FDI and tariff liberalization) on the average plant productivity levels. We first propose a modification of the Levinsohn- Petrin (2003) proposed methodology to identify the production function and estimate total factor productivity at the plant-level. We then use a difference-in-differences regression framework to identify the effects of different reforms on total factor productivity (which we define as the residual from the estimated production function). 17 Since we have a repeated cross-section (survey) dataset, we cannot construct the capital series directly for each plant. 12
13 5.1 Methodology We assume the Cobb-Douglas production function: v j it = βj l.l it + β j n.n it + β j k.k it + e j it (1) where v is the log real value added, l is the log of the number of production (blue collar) employees, n is the log of the number of non-production (white collar) employees and k is the log of the real capital employed. We allow the coefficients in the production function to vary by (2-digit NIC) industry (indexed by j), by estimating the production function separately for each industry. The index i stands for the plant and t stands for the year. We define total factor productivity as the residual e it (as in e.g.olley and Pakes, 1996). We assume that the productivity residual has two components (we drop the industry index j from our notation to reduce clutter): e it = ω it + η it (2) where ω it is the component of the productivity shock that is known to the decision-maker before she makes the choice of inputs (k it, l it and n it ), but is unobserved by the econometrician. This transmitted component thus leads to a correlation between the input variables (regressors) and the productivity residual (error term), potentially biasing the coefficients estimated using the OLS methodology. 18 The component η it, which is assumed to be orthogonal to the regressors, captures all other deviations from the hypothesized production function, arising from classical measurement error, optimizing errors, etc. To address possible endogeneity of variable inputs, we adapt the structural technique proposed by Levinsohn and Petrin (2003) (LP) for a panel dataset to our repeated cross-section setting. Essentially the LP approach uses information from an input choice equation to control for the endogenous productivity term. Instead of using the prior period productivity for the establishment to derive the predicted component of the current productivity shock, we used the average productivity in the prior period for a matched industry-location-size cell. 19 The LP methodology solves the endogeneity issue at the cost of placing considerable structure on the problem. To ensure that our results are not driven by assumptions underlying the production function estimation methodology, we cross-check our results using a range of alternative approaches in section The transmitted component could arise from correlation in productivity shocks over time, or due to anticipated shocks to productivity. See Griliches and Mairesse (1995) for a comprehensive review of the literature addressing this problem. 19 Details on the estimation procedure used is presented in a supplementary appendix B. We find that, compared to the OLS estimates, the modified LP procedure yielded higher coefficients on the capital variable, and considerably lower coefficients on the labor variables, mirroring the findings reported by LP (in the right direction as per Griliches and Mairesse (1995, p19)). The returns to scale estimates are lower (and close to one) under the modified LP methodology. 20 For example, given the restrictive and changing regulatory conditions, it is possible that the assumption (implicit in the LP methodology) of common input and output prices across firms within an industry does not hold for some of the industries in our sample. 13
14 To analyze the short-run and longer-term effects of various reforms on plant productivity levels, we assume the following form for the productivity residual: e it = α t + α j + β 1 D s it + β 2 D l it + ɛ it (3) where α t captures year effects, α j captures industry (4 digit NIC code) fixed effects, the dummy D s it takes on the value 1 if the plant belongs to a liberalized industry and the year is 1991 or 1993 (short-run, post-reform), and Dit l takes on the value 1 if the firm belongs to a liberalized industry and the year is 1994 or 1995 (long-run, post-reform). The coefficient β 1 reflects the short-run difference-in-differences (DD) effect of the reform, while β 2 reflects the longer-term DD effect of the reform. The error term ɛ it captures the remaining variation in productivity residual (including idiosyncratic shocks), and is assumed to be orthogonal to the liberalization dummies (see discussion in section 5.5). 21 The effects of the various reforms could be analyzed using two alternative approaches. One, we could consolidate equations 1 and 3, or two, we could adopt a two-stage procedure: estimate equation 1 in the first stage and run equation 3 in the second stage (using the coefficients identified in the first stage to define the productivity residual). We found that the coefficients on the variables of interest are almost identical under the two approaches. Also, the latter procedure allows for modifying the specification without having to re-estimate the coefficients (which is very computationally intensive under the modified LP procedure). Hence we present all results using the latter approach. As pointed out by Bertrand, Duflo, and Mullainathan (2004), the standard errors of difference-in-differences estimators could be severely biased if we use variation within treatment groups without allowing for the errors to be correlated within each group. We code liberalization regimes at the 4-digit NIC level and hence allow for arbitrary correlation structure for the error terms within industries (by clustering on 4-digit NIC codes). 5.2 Baseline results To understand the broad trends in the liberalized and non-liberalized sectors, we plot the mean productivity levels for the different groups of industries in Figure III. The graph suggests that the difference in means between the liberalized and the non-liberalized groups increases after the reforms, especially towards the end of our panel period. The mean productivity level in all the groups show a similar pattern in the pre-reform period. Following the reforms, the mean productivity levels in non-liberalized group shows a decline, while the productivity level in the tariff liberalized group shows a big upturn after the reforms. The FDI group shows no significant change in the first two years, but then shows a large upturn in the last two years. 21 The term short-run and long-run are used mainly as a short-hand to distinguish the effects in the first 2-3 years versus the effects in the last 2 years of our sample. It does not have a precise meaning in the sense of other definitions of the term in Economics; in particular, some effects of the reforms may take longer than the 4-5 year period that we examine here to be fully realized, so some of the longer term effects are not captured here. 14
15 Note that the FDI group is relatively the least productive in the pre-reform period, so their change relative to the other group is noteworthy. Table 3 presents the regression results for FDI and tariff liberalizations. Our regression analysis confirms the significance of effects observed in Figure III. The sample in the regression in column 1 excludes industries that have tariff liberalization dummy equal to one, so that it captures the effect on establishments that faced only the FDI liberalization, relative to establishments that received neither form of liberalization (per our baseline reform dummy definitions). Column 2 similarly excludes FDI liberalized industries, so that tariff liberalized sectors are compared to those that have neither of liberalization dummy equal to one. In Column 3, we include the full sample and include only the direct dummy variables. In column 4, we include the full sample, both sets of dummy variables, and interactions of the dummy variable. This allows for the effects of the reforms to be complimentary (reinforcing each other) or to be substitutes (offsetting one another). As we can see comparing columns 1 and 2 to 4, the individual reform dummy variables capture the effects of the reforms relative to the non-reformed sector, excluding effects of the small group of industries that receive both reforms ( which we term the overlap group). The mean effect for the overlap group can be backed out by adding the coefficients on the direct effects to the coefficient on the interaction term. In this setup, the effect of the FDI reform alone (setting the tariff reform to zero) is captured by coefficient on the direct FDI term in column 4. In particular, the difference-in-differences effect of the FDI reform by itself in the period is log points, as reflected in row 2 of columns 1 and 4. Similarly, the effect of the tariff reform by itself in the period is log points, as reflected in row four of columns 2 and 4. The interaction of the two reforms helps us to isolate the effect in the overlap group of plants that have both reform dummies equal to one. The negative and significant coefficient log points on the interaction term in longer term ( ), implies that the effect for the overlap group is smaller than the sum of the individual effects. In particular, the mean effect in the overlap group is ( ). Tests show that this is significantly different from zero (prob > F =3.2%), and we cannot reject the null that it is equal to the long term FDI effect alone (prob > F =75.98%) or the long term tariff effect alone (prob > F = 20.88%). Thus there appears to be no reinforcement of effects in the overlap group. The negative interaction term suggests that the reforms were substitutes in the sense that the effect for the overlap group is not statistically different from that from any one reform group alone. In column 3, the lack of reinforcement of effects in the overlap group brings down the effect for each of the reform coefficients. In order to cleanly separate out the effects of the individual reforms, we will focus on specification 4 (or specifications like in column 1 and 2) in the rest of the paper. We conclude that both FDI and tariff liberalizations resulted in significant improvements in mean intra-plant productivity levels in the liberalized industries. These improvements take 15
16 a couple of years to be realized; we find little effect in the two years immediately following the reforms. We find the delayed effect reasonable since changes required for improving total factor productivity, such as changes in work flows or production processes, could take time to yield benefits. Further, delays could also be due to concerns by firms about the permanence of the reforms (see discussion in section 8). Finally, pressure in the form price competition may not arise immediately after the reforms (see Section 7). 5.3 Robustness to alternative measures of productivity As discussed in section 5.1, there may be reasons to worry that our results are driven by assumptions underlying the modified LP methodology used to derive the productivity residual in our base case (Table 3). Accordingly, in this section we examine if our results are robust to eight alternative measurements of the productivity residual. The results are reported in Table 4. For the sake of conciseness, we report only on the long-run effects of the reforms (as short-run effects continue to be generally small and insignificant). Column 1 repeats the baseline for comparison purposes. In column 2, we use OLS (including industry fixed effects) to estimate the production function (equation 1). In column 3, we estimate the residual based on the methodology proposed by Olley and Pakes (1996), using investment to proxy for unobserved productivity disturbances (we do not control for exits since this is unidentifiable in our data). In column 4, we use an instrumental variables (IV) approach to identify the production function, using as instruments plant level blue and white collar wage rates (for blue and white collar labor), and debt level and interest rate as instruments for the capital variable. 22 In column 5, given the skewness in the key variables (see Table 2(b)), in order to ensure that our results are not driven by a handful of extreme values, we redo our analysis after winsorizing the productivity variable by 2.5% on both tails of its distribution. In column 6, we use the commonly used Solow index definition of productivity (valid under the assumptions of constant returns to scale and perfect competition): log(tfp) = [v s l.l s n.n (1 s l s n ).k], where v is log real value added, l is log of the number of blue collar employees, n is log of the number of white collar employees, s l is the share of blue collar wages in value added and s n is the share of white collar wages in value added. We evaluate the shares (s l and s n ) as the aggregate shares for the relevant 4-digit NIC code industries. In column 7, we use the residual from a gross output production function specification. Our base case real value added production function specification implicitly assumes a strong form of separability in intermediate inputs (Bruno 1978). To check robustness, we estimate productivity as the residual from a full production function, i.e. defining real output as a function of real intermediate inputs (including materials, fuels and other inputs), labor (blue and white collar) and capital. For computational convenience, we estimate the full production 22 Similar instruments have been used previously in the literature (e.g., Harrison, 1994), but have been critiqued (see Griliches and Mairesse, 1995). We do not see this as a superior identification strategy, and use this merely as a cross-check on the robustness of our results. 16
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