Professor Christina Romer. LECTURE 16 TECHNOLOGICAL CHANGE AND ECONOMIC GROWTH March 13, 2018
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1 Economics 2 Spring 2018 Professor Christina Romer Professor David Romer LECTURE 16 TECHNOLOGICAL CHANGE AND ECONOMIC GROWTH March 13, 2018 I. OVERVIEW A. Two central topics of macroeconomics B. The key determinants of potential output C. The enormous variation in potential output per person across countries and over time D. Discussion of the paper by William Nordhaus II. AGGREGATE PRODUCTION FUNCTION A. Decomposition of Y*/POP into normal average labor productivity (Y*/N*) and the normal employment-to-population ratio (N*/POP) B. N*/POP is largely determined by non-economic factors (such as demographics) C. Determinants of average labor productivity: capital per worker and technology III. EXPLAINING THE VARIATION IN THE LEVEL OF Y*/POP ACROSS COUNTRIES A. Limited contribution of N*/POP B. Crucial role of normal capital per worker (K*/N*) C. Crucial role of technology especially institutions IV. DETERMINANTS OF ECONOMIC GROWTH A. Limited contribution of N*/POP B. Important, but limited contribution of K*/N* C. Crucial role of technological change V. HISTORICAL EVIDENCE OF TECHNOLOGICAL CHANGE A. New production techniques B. New goods C. Better institutions VI. SOURCES OF TECHNOLOGICAL PROGRESS A. Supply and demand diagram for invention B. Factors that could shift the supply and demand curves C. Does the market produce the efficient amount of invention? D. Policies to encourage technological progress
2 Economics 2 Spring 2018 Christina Romer David Romer LECTURE 16 Technological Change and Economic Growth March 13, 2018
3 Announcement Problem Set 4 is being handed out. It is due at the beginning of lecture next Tuesday (March 20). The ground rules are the same as on previous problem sets. Optional problem set work session: Thursday, 4:00 6:00, in 648 Evans.
4 I. OVERVIEW
5 Real GDP in the United States, Source: FRED (Federal Reserve Economic Data); data from Bureau of Economic Analysis.
6 Two Key Topics of Macroeconomics The long-run trend in output. Short-run fluctuations (booms and recessions). In the short run, the economy s use of its available resources can be above or below normal; this is central to short-run fluctuations. In the long run, output is determined by the economy s available resources.
7 Potential Output (Y*) The amount of output that the economy produces when using its resources at normal rates. The three key determinants of potential output: Labor Capital Technology
8 Variation in Potential Output per Person Differs enormously across countries. In many (but not all) countries, it has grown enormously over time.
9 GDP per Capita in 8 Countries since 1870 Source: Frank, Bernanke, Antonovics, and Heffetz, Principles of Economics.
10 Paper by William Nordhaus Argues that growth of real GDP in U.S. over the last two centuries may have been faster than conventionally measured. Related to mismeasurement in price indexes.
11 Consumer Price Index A measure of the overall or aggregate level of prices. CPI t = Price of market basket in year t Price of market basket in base year
12 Paper by William Nordhaus What problems does Nordhaus see with typical price measures? There may be quality changes. New goods are being introduced all the time. What example does he use to illustrate the likely importance of these problems? Lighting.
13 Source: Nordhaus, Do Real-Output and Real-Wage Measures Capture Reality?
14 Alternative Light Prices True Price Source: Nordhaus, Do Real-Output and Real-Wage Measures Capture Reality?
15 Why Mismeasurement of Inflation Leads to Mismeasurement of Growth Real GDP in year t 2 Real GDP in year t 1 = Nominal GDP t2 GDP Price Index t2 Nominal GDP t1 GDP Price Index t1 = Nominal GDP t 2 Nominal GDP t1 GDP Price Index t 1 GDP Price Index t2 If the growth of the price index from year t 1 to year t 2 is overstated, the growth of real GDP is understated. The same argument applies to the growth of real wages.
16 Were You Persuaded by Nordhaus?
17 II. THE AGGREGATE PRODUCTION FUNCTION
18 Decomposition of Potential Output per Person where: Y* is potential output; POP is population; N* is normal employment. is the normal employment-to-population ratio. is normal average labor productivity.
19 Many of the Most Important Determinants of the Normal Employment-to-Population Ratio Are Not Economic It depends on things like the age composition of the population, tastes, etc.
20 Determinants of Average Labor Productivity is normal capital per worker. T is technology.
21 Capital Aids to the production process that were created in the past. Components of Capital: Conventional physical capital (machines, buildings, computers). Infrastructure (roads, telecommunications systems, dams) is also part of physical capital. Human capital (education, job training).
22 Technology The methods for producing things. Components of Technology: Production techniques Management techniques Economic institutions Local culture
23 Aggregate Production Function (1) (2) (3)
24 III. EXPLAINING THE VARIATION IN THE LEVEL OF POTENTIAL OUTPUT PER PERSON ACROSS COUNTRIES
25 Contribution of the Employment-to-Population Ratio It can certainly matter, but its effects are limited. It doesn t vary that much across countries.
26 Source: Charles Jones and Dietrich Vollrath, Economic Growth.
27 Contribution of Capital per Worker Physical and human capital does vary a lot across countries. And likely explains about half of the variation in normal output per capita across countries.
28 GDP Statistics for Selected Countries Physical Capital Human Capital GDP per Capita per Worker per Worker (Index) Rich countries U.S.A 43, , Japan 33, , France 31, , U.K. 35, , Poor countries China 6,415 57, India 3,078 20, Nigeria 1,963 8,516 n.a. Uganda 1,122 n.a Growth miracles Hong Kong 37, , Singapore 49, , Taiwan 29, , South Korea 25, , Growth disasters Venezuela 9,762 91, Zimbabwe 135 1, Source: Jones and Vollrath, Economic Growth, and Penn World Tables.
29 Contribution of Technology The types of technology that vary significantly across countries are probably not knowledge, but institutions and culture. And this variation is an important source of the variation in normal output per capita.
30 Source: Gallup and Sachs, The Economic Burden of Malaria.
31 Source: Gallup and Sachs, The Economic Burden of Malaria.
32 Three Key Features of Institutions that Contribute to High Normal Output per Person A market-based system for allocating resources. Government protection of property from others. Protection of property from government corruption, theft, arbitrary taxation,.
33 Average Labor Productivity and Social Infrastructure Source: Hall and Jones, Why Do Some Countries Produce So Much More Output per Worker than Others?
34 IV. DETERMINANTS OF ECONOMIC GROWTH
35 Aggregate Production Function (1) (2) (3)
36 Employment-to-Population Ratio in the U.S. Source: Frank, Bernanke, Antonovics, and Heffetz, Principles of Economics.
37 Labor Force Participation Rate for Women in the U.S Percent Source: Bureau of Labor Statistics
38 Can Increases in N*/POP Explain Growth? An increase in N*/POP will raise Y*/POP, and there have been periods when rises in N*/POP had a noticeable impact on growth. But, N*/POP doesn t tend to change much, and it can t rise indefinitely. And its contribution is limited by diminishing returns: When N*/POP rises, K*/N* tends to fall, and so Y*/POP rises less than proportionally with N*/POP.
39 Aggregate Production Function (1) (2) (3)
40 Can Increases in K*/N* Explain Growth? The Case of Physical Capital An increase in K*/N* will raise Y*/POP, and there have been periods when capital accumulation was important to growth. But, diminishing returns means that doubling K*/N* less than doubles Y*/POP. Observed increases in K*/N* are not large enough to account for much of the observed rise in Y*/POP over time.
41 Can Increases in K*/N* Explain Growth? The Case of Human Capital Human capital has increased substantially over the past 100+ years. The increases probably account for a moderate amount of the observed rise in Y*/POP over time.
42 Source: Economic Report of the President 2010.
43 Technological change is a key determinant of economic growth Argument by elimination: If it is not N*/POP or K*/N*, it must be T.
44 V. HISTORICAL EVIDENCE OF TECHNOLOGICAL CHANGE
45 New Production Techniques New machines (electric motor, tractor). New methods of organization and management (assembly line, accounting).
46 Early Textile Mill
47 Modern Textile Factory
48 Social Savings from the Farm Tractor in 1954 Source: Steckel and White, Engines of Growth.
49 New Products Another way to create improvements in the standard of living.
50
51 Better Institutions Example: Opening up to trade. Example: More reliance on market forces.
52 VI. SOURCES OF TECHNOLOGICAL PROGRESS
53 Market for Inventions P S 1 P 1 D 1 Q 1 Q
54 Factors Increasing the Supply of Inventions P P 1 P 2 S 1 S 2 1. Luck 2. Education 3. Culture 4. Others? D 1 Q 1 Q 2 Q
55 Factors Increasing the Demand for Inventions P P 2 P 1 Q 1 Q 2 S 1 D 2 D 1 Q 1. More secure property rights 2. Increased competition 3. National emergencies 4. Others?
56 Does the Free Market Produce the Efficient Amount of Inventive Activity? Almost certainly not: Inventions appear to have large positive externalities. This is especially true for basic science.
57 Market for Inventions P S 1,PMC 1, SMC 1 D 1,PMB 1 SMB 1 Q 1 Q* Q
58 Policies to Encourage Technological Progress Increase education. Subsidize research and development, particularly for basic science. Make property rights more secure. And remember that better institutions are a form of technological progress which is especially relevant to poor countries.
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