Uncertainty and Economic Activity: A Global Perspective

Transcription

1 Uncertainty and Economic Activity: A Global Perspective Ambrogio Cesa-Bianchi 1 M. Hashem Pesaran 2 Alessandro Rebucci 3 IV International Conference in memory of Carlo Giannini 26 March Bank of England. The views expressed in this paper are solely those of the authors and should not be taken to represent those of the Bank of England. 2 University of Southern California and Trinity College, Cambridge 3 Johns Hopkins University Carey Business School 1/ 29

2 The relation between uncertainty and economic activity World GDP (percent, left ax.) VIX (Index, right ax.) During the recent global financial crisis the world economy experienced a sharp and synchronized contraction in economic activity and an exceptional increase in macroeconomic and financial uncertainty/volatility Introduction 2/ 29

3 What we do in this paper Main question: what is the impact of uncertainty on economic activity? We model the interrelation between uncertainty and macroeconomic dynamics as a two-way process We adopt a global perspective Introduction 3/ 29

4 What we do in this paper Main question: what is the impact of uncertainty on economic activity? We model the interrelation between uncertainty and macroeconomic dynamics as a two-way process We adopt a global perspective Identifying assumptions Both uncertainty and the business cycle are driven (with a different timing) by a similar set of global common factors Conditional on these global factors, country-specific macro dynamics are cross-sectionally weakly correlated Introduction 3/ 29

5 Methodology A global model of volatility and the business cycle Global Vector Autoregressive (GVAR) methodology (Pesaran, Schuermann, and Weiner, 2004) Model the business cycle component of the global economy Introduction 4/ 29

6 Methodology A global model of volatility and the business cycle Global Vector Autoregressive (GVAR) methodology (Pesaran, Schuermann, and Weiner, 2004) Model the business cycle component of the global economy Combine the GVAR with a volatility module consistent with our assumptions Model (global) volatility Identify volatility innovations that are orthogonal to global factors Introduction 4/ 29

7 Methodology A global model of volatility and the business cycle Global Vector Autoregressive (GVAR) methodology (Pesaran, Schuermann, and Weiner, 2004) Model the business cycle component of the global economy Combine the GVAR with a volatility module consistent with our assumptions Model (global) volatility Identify volatility innovations that are orthogonal to global factors Investigate the explanatory power of identified volatility innovations for economic activity Introduction 4/ 29

8 Contribution Main contribution to the literature Novel identifying assumptions to investigate the interaction between volatility and the business cycle Introduction 5/ 29

9 Contribution Main contribution to the literature Novel identifying assumptions to investigate the interaction between volatility and the business cycle Other contributions Data set of quarterly measures of realized volatilities (as a proxy for uncertainty) using daily returns across 109 asset prices from 4 asset classes worldwide Empirical model of volatility and the business cycle for 33 countries representing over 90 percent of the world economy Introduction 5/ 29

10 Main findings Theoretical In a bivariate VAR with output growth and volatility (akin to what is typically done in the literature), the output growth equation is mis-specified as associated least squares estimates are inconsistent Introduction 6/ 29

11 Main findings Theoretical In a bivariate VAR with output growth and volatility (akin to what is typically done in the literature), the output growth equation is mis-specified as associated least squares estimates are inconsistent Empirical Realized volatilities strongly co-move within asset classes, but are not as highly correlated across asset classes Strong negative statistical association between future output growth and current volatility Exogenous changes to volatility have no statistically significant impact on economic activity over and above that of its common component Introduction 6/ 29

12 How has the literature approached this question? Wait and see assumption Bloom (2009): uncertainty ordered before activity in a VAR Introduction 7/ 29

13 How has the literature approached this question? Wait and see assumption Bloom (2009): uncertainty ordered before activity in a VAR Challenging the wait and see assumption: the by product assumption Bachmann et al (2013): confidence ordered before uncertainty Gilchrist et al (2013): credit spreads ordered before uncertainty Introduction 7/ 29

14 How has the literature approached this question? Wait and see assumption Bloom (2009): uncertainty ordered before activity in a VAR Challenging the wait and see assumption: the by product assumption Bachmann et al (2013): confidence ordered before uncertainty Gilchrist et al (2013): credit spreads ordered before uncertainty Recent attempts to determine causality Baker and Bloom (2013) instrumental variable approach Caldara et al (2013) two-steps penalty function approach Introduction 7/ 29

15 Outline 1. A simple factor model 2. The GVAR-VOL model 3. Data: realized volatility measures 4. Empirical results 5. Conclusions A simple factor model 8/ 29

16 A factor model of volatility and macro dynamics We consider the following dynamic specification for v t and y it v t = Φ 1v v t 1 + Λn t + ξ t, y it = Φ 1i y i,t 1 + Γ i n t 1 + ζ it (volatility equation) (macro equation) for i = 0, 1,..., N A simple factor model 8/ 29

17 A factor model of volatility and macro dynamics We consider the following dynamic specification for v t and y it v t = Φ 1v v t 1 + Λn t + ξ t, y it = Φ 1i y i,t 1 + Γ i n t 1 + ζ it (volatility equation) (macro equation) for i = 0, 1,..., N Unobserved global factors (n t ) capture the dynamics of the world economy, political events, wars, natural disasters, or noisy information A simple factor model 8/ 29

18 A factor model of volatility and macro dynamics We consider the following dynamic specification for v t and y it v t = Φ 1v v t 1 + Λn t + ξ t, y it = Φ 1i y i,t 1 + Γ i n t 1 + ζ it (volatility equation) (macro equation) for i = 0, 1,..., N Unobserved global factors (n t ) capture the dynamics of the world economy, political events, wars, natural disasters, or noisy information Main assumption: financial markets and their volatility are more immediately affected by such global factors n t as compared to the real economy Habits, adjustment costs, government regulation,... A simple factor model 8/ 29

19 Solving the factor model for the volatility equation Since n t is unobserved, a direct relationship between y it and v t can be established if n t is eliminated from the above system of equations A simple factor model 9/ 29

20 Solving the factor model for the volatility equation Since n t is unobserved, a direct relationship between y it and v t can be established if n t is eliminated from the above system of equations Taking averages across countries, the macro equation can be written as ȳ t = Φ 1 ȳ t 1 + Γn t 1 + ζ t, A simple factor model 9/ 29

21 Solving the factor model for the volatility equation Since n t is unobserved, a direct relationship between y it and v t can be established if n t is eliminated from the above system of equations Taking averages across countries, the macro equation can be written as ȳ t = Φ 1 ȳ t 1 + Γn t 1 + ζ t, Solve for n t 1 and substitute into the volatility equation v t = Φ 1v v t 1 + Ψ 1,v ȳ t+1 + Ψ 0,v ȳ t Ψ 1,v ζt+1 + ξ t Volatility responds to expected changes in economic activity A simple factor model 9/ 29

22 Analyzing the volatility equation Estimation issue: there is an endogeneity problem since ȳ t+1 and ζ t+1 are correlated v t = Φ 1v v t 1 + Ψ 1,v ȳ t+1 + Ψ 0,v ȳ t Ψ 1,v ζt+1 + ξ t A simple factor model 10/ 29

23 Analyzing the volatility equation Estimation issue: there is an endogeneity problem since ȳ t+1 and ζ t+1 are correlated v t = Φ 1v v t 1 + Ψ 1,v ȳ t+1 + Ψ 0,v ȳ t Ψ 1,v ζt+1 + ξ t OLS estimates are inconsistent! This result does not depend on the timing assumption However, for N sufficiently large we have that ζ t+1 p 0 as N A simple factor model 10/ 29

24 Analyzing the volatility equation Estimation issue: there is an endogeneity problem since ȳ t+1 and ζ t+1 are correlated v t = Φ 1v v t 1 + Ψ 1,v ȳ t+1 + Ψ 0,v ȳ t Ψ 1,v ζt+1 + ξ t OLS estimates are inconsistent! This result does not depend on the timing assumption However, for N sufficiently large we have that ζ t+1 p 0 as N By using a small open economy assumption and the law of large numbers applied to cross-sectionally weakly correlated processes, we can address the endogeneity problem and achieve identification! A simple factor model 10/ 29

25 Solving the factor model for the macro equation Solve for n t in the volatility equation and substitute in the macro equation y it = Φ 1i y i,t 1 + Ξ i1 v t 1 Ξ i2 v t 2 + ζ it Ξ i1 ξ t 1 }{{} u it The above expression has the familiar appearance of the reduced form equation of y it in a bivariate VAR for y it and v t as typically considered by the literature A simple factor model 11/ 29

26 Solving the factor model for the macro equation Solve for n t in the volatility equation and substitute in the macro equation y it = Φ 1i y i,t 1 + Ξ i1 v t 1 Ξ i2 v t 2 + ζ it Ξ i1 ξ t 1 }{{} u it The above expression has the familiar appearance of the reduced form equation of y it in a bivariate VAR for y it and v t as typically considered by the literature But due to the dependence of v t 1 on ξ t 1 OLS estimates are inconsistent! A simple factor model 11/ 29

27 Solving the factor model for the macro equation Solve for n t in the volatility equation and substitute in the macro equation y it = Φ 1i y i,t 1 + Ξ i1 v t 1 Ξ i2 v t 2 + ζ it Ξ i1 ξ t 1 }{{} u it The above expression has the familiar appearance of the reduced form equation of y it in a bivariate VAR for y it and v t as typically considered by the literature But due to the dependence of v t 1 on ξ t 1 OLS estimates are inconsistent! Again, this result does not depend on the timing assumption and it holds even if we adopt a global perspective A simple factor model 11/ 29

28 A more general framework The GVAR-VOL model While the bivariate representation above is appealing for its simplicity, in practice there are many sources of volatility and many countries in the world economy High dimensional nature of the problem = N must be sufficiently large GVAR-VOL model 12/ 29

29 A more general framework The GVAR-VOL model While the bivariate representation above is appealing for its simplicity, in practice there are many sources of volatility and many countries in the world economy High dimensional nature of the problem = N must be sufficiently large The GVAR-VOL A GVAR model for y it (where i = 0, 1,..., N) is developed by estimating separate country-specific models conditional on the global and country-specific factors and is then combined with a volatility module GVAR-VOL model 12/ 29

30 GVAR First step Consider a vector of country-specific macro-financial variables x it = ( y it, ) χ it GVAR-VOL model 13/ 29

31 GVAR First step Consider a vector of country-specific macro-financial variables x it = ( y it, ) χ it VARX*(1,1) model for country i x i,t = Φ i x i,t 1 + Λ 0i x it + Λ 1ix i,t 1 + ε it GVAR-VOL model 13/ 29

32 GVAR First step Consider a vector of country-specific macro-financial variables x it = ( y it, ) χ it VARX*(1,1) model for country i x i,t = Φ i x i,t 1 + Λ 0i x it + Λ 1ix i,t 1 + ε it Country-specific foreign variables x it are x it = N j=0 w ij x jt = W i x t x t = (x 0t, x 1t,..., x Nt ) is the vector of all endogenous variables W i is a matrix of fixed trade weights GVAR-VOL model 13/ 29

33 GVAR Second step Define a selection matrix S i such that x it = S i x t S i x t = Φ i S i x t 1 + Λ 0i W i x t + Λ 1i W i x t 1 + ε it GVAR-VOL model 14/ 29

34 GVAR Second step Define a selection matrix S i such that x it = S i x t S i x t = Φ i S i x t 1 + Λ 0i W i x t + Λ 1i W i x t 1 + ε it Re arrange G i x t = H i x t 1 + ε it GVAR-VOL model 14/ 29

35 GVAR Second step Define a selection matrix S i such that x it = S i x t S i x t = Φ i S i x t 1 + Λ 0i W i x t + Λ 1i W i x t 1 + ε it Re arrange G i x t = H i x t 1 + ε it Stack each country-specific model for i = 0, 1,..., N Gx t = Hx t 1 + ε t, GVAR-VOL model 14/ 29

36 GVAR Second step Define a selection matrix S i such that x it = S i x t S i x t = Φ i S i x t 1 + Λ 0i W i x t + Λ 1i W i x t 1 + ε it Re arrange G i x t = H i x t 1 + ε it Stack each country-specific model for i = 0, 1,..., N Gx t = Hx t 1 + ε t, Get the reduced form GVAR model x t = Fx t 1 + u t, GVAR-VOL model 14/ 29

37 Volatility module ARDL model as the one sketched above v t = Φ v v t 1 + Ψ 1,v y t+1 + Ψ 0,v y t + Ψ 1,v y t 1 + ξ t, GVAR-VOL model 15/ 29

38 Volatility module ARDL model as the one sketched above v t = Φ v v t 1 + Ψ 1,v y t+1 + Ψ 0,v y t + Ψ 1,v y t 1 + ξ t, Re-write as v t = Φ v v t 1 + Ψ 1,v P x t+1 + Ψ 0,v P x t + Ψ 1,v P x t 1 + ξ t P is a weighting and selection matrix made up of zeros and PPP-GDP weights Only the macroeconomic variables (y it ) and not the financial variables (χ it ) are selected from x t GVAR-VOL model 15/ 29

39 The GVAR-VOL model The combined GVAR-VOL can be written as [ ] [ ] vt 1 Ξ 0 = Ξ 1 x t vt x t [ ξt u t+1 ] GVAR-VOL model 16/ 29

40 The GVAR-VOL model The combined GVAR-VOL can be written as [ ] [ ] vt 1 Ξ 0 = Ξ 1 x t vt x t [ ξt u t+1 ] The only way a volatility innovation (ξ t ) can have an impact on activity is via its correlation with the reduced-form residuals of the GVAR (u t+1 ) Two important implications of our assumptions A causal interpretation is valid only for macro variables (less so for financial variables) The volatility innovations can affect the GVAR residuals only with a lag GVAR-VOL model 16/ 29

41 Data for the construction of realized volatility measures Country-specific asset markets Daily prices for 33 advanced and emerging economies stock market equity indices exchange rates long-term government bonds Data 17/ 29

42 Data for the construction of realized volatility measures Country-specific asset markets Daily prices for 33 advanced and emerging economies stock market equity indices exchange rates long-term government bonds International commodity markets Daily prices for 17 internationally traded commodities Data 17/ 29

43 Data for the construction of realized volatility measures Country-specific asset markets Daily prices for 33 advanced and emerging economies stock market equity indices exchange rates long-term government bonds International commodity markets Daily prices for 17 internationally traded commodities Final data set The data set spans 109 asset prices and, for each asset price, up to 8479 daily observations from 1979 to 2011 Data 17/ 29

44 Market-specific realized volatility measures Realized volatility for asset of type κ, in country i, at quarter t D t RV κit = D 1 t (r κit (τ) r κit ) 2 τ=1 r κit (τ) = ln P κit (τ) is the daily return asset of type κ, in country i, measured on close of day τ in quarter t r κit = D 1 t D t τ=1 r κit(τ) is the average daily price changes over the quarter t D t is the number of trading days in quarter t Data 18/ 29

45 U.S. equity realized volatility and the VIX Index RV US Equity (left ax.) VIX Index (right ax.) Data 19/ 29

46 Aggregated measures of realized volatility Asset-specific realized volatility RV κt = N t w it RV κit i=1 Global volatility RV t = 1 M M N t κ=1 i=1 w it RV κit Data 20/ 29

47 Global & Asset-specific volatility measures Equity Prices Exchange Rates Long term Bonds Commodity Prices Asset specific Realized Volatility RV κ (left ax.) Global Realized Volatility RV (right ax.) Data 21/ 29

48 Empirical results Stylized facts Time series properties of realized volatility Unconditional correlation with economic activity GVAR-VOL GVAR Volatility module Relation between volatility innovations and GVAR residuals Empirical results 22/ 29

49 Empirical results Stylized facts Time series properties of realized volatility Unconditional correlation with economic activity GVAR-VOL GVAR Volatility module Relation between volatility innovations and GVAR residuals Empirical results 22/ 29

50 Volatility module estimation Realized volatility measures for four asset classes Equity prices, exchange rates, long-term government bonds, and commodity prices Empirical results 23/ 29

51 Volatility module estimation Realized volatility measures for four asset classes Equity prices, exchange rates, long-term government bonds, and commodity prices We model the (4 1) vector v t as a VAR model [ = Φ y v + Ψ t+1 1,v v EQ,t v FX,t v LB,t v COM,t v EQ,t 1 v FX,t 1 v LB,t 1 v COM,t Ψ 0,v [ y t π t ] π t+1 + Ψ 1,v [ y t 1 π t 1 ] +... ] + ξ EQ,t ξ FX,t ξ LB,t ξ COM,t Empirical results 23/ 29

52 Volatility module estimation Realized volatility measures for four asset classes Equity prices, exchange rates, long-term government bonds, and commodity prices We model the (4 1) vector v t as a VAR model [ = Φ y v + Ψ t+1 1,v v EQ,t v FX,t v LB,t v COM,t v EQ,t 1 v FX,t 1 v LB,t 1 v COM,t Ψ 0,v [ y t π t ] π t+1 + Ψ 1,v [ y t 1 π t 1 ] +... ] + ξ EQ,t ξ FX,t ξ LB,t ξ COM,t Empirical results 23/ 29

53 Volatility module estimation (cont d) v EQ,t v FX,t v LB,t v COM,t c [3.91] [5.25] [2.97] [5.50] v EQ,t [5.86] [-2.16] [-0.55] [-1.52] v FX,t [0.36] [6.54] [-0.01] [0.02] v LB,t [-0.06] [-0.64] [9.37] [1.37] v COM,t [-1.12] [-0.19] [-0.37] [6.02] yt [-5.41] [-4.04] [-3.17] [-2.50] πt [1.57] [1.14] [0.28] [-2.03] yt [0.85] [-1.73] [-0.46] [-1.52] πt [-0.17] [1.50] [0.44] [0.94] yt [-0.02] [-0.32] [-0.27] [0.27] πt [-0.61] [-0.48] [0.48] [-0.25] Empirical results 24/ 29

54 Volatility module estimation (cont d) v EQ,t v FX,t v LB,t v COM,t c [3.91] [5.25] [2.97] [5.50] v EQ,t [5.86] [-2.16] [-0.55] [-1.52] v FX,t [0.36] [6.54] [-0.01] [0.02] v LB,t [-0.06] [-0.64] [9.37] [1.37] v COM,t [-1.12] [-0.19] [-0.37] [6.02] yt [-5.41] [-4.04] [-3.17] [-2.50] πt [1.57] [1.14] [0.28] [-2.03] yt [0.85] [-1.73] [-0.46] [-1.52] πt [-0.17] [1.50] [0.44] [0.94] yt [-0.02] [-0.32] [-0.27] [0.27] πt [-0.61] [-0.48] [0.48] [-0.25] Empirical results 24/ 29

55 Volatility module estimation (cont d) v EQ,t v FX,t v LB,t v COM,t c [3.91] [5.25] [2.97] [5.50] v EQ,t [5.86] [-2.16] [-0.55] [-1.52] v FX,t [0.36] [6.54] [-0.01] [0.02] v LB,t [-0.06] [-0.64] [9.37] [1.37] v COM,t [-1.12] [-0.19] [-0.37] [6.02] yt [-5.41] [-4.04] [-3.17] [-2.50] πt [1.57] [1.14] [0.28] [-2.03] yt [0.85] [-1.73] [-0.46] [-1.52] πt [-0.17] [1.50] [0.44] [0.94] yt [-0.02] [-0.32] [-0.27] [0.27] πt [-0.61] [-0.48] [0.48] [-0.25] Empirical results 24/ 29

56 The macroeconomic impact of volatility innovations Estimate the following country-specific, variable-specific equations û ilt = α il ξ t 1 + ζ ilt, Empirical results 25/ 29

57 The macroeconomic impact of volatility innovations Estimate the following country-specific, variable-specific equations û ilt = α il ξ t 1 + ζ ilt, û ilt picks up the GVAR residuals of variable l in country i Empirical results 25/ 29

58 The macroeconomic impact of volatility innovations Estimate the following country-specific, variable-specific equations û ilt = α il ξ t 1 + ζ ilt, û ilt picks up the GVAR residuals of variable l in country i ξ t is the average of the volatility module residuals constructed as ξ t = 1 M M ˆξ κt κ=1 We define ξ t a global volatility shock Empirical results 25/ 29

59 Global volatility innovations and GVAR residuals GDP α y i t-stat R 2 ARGENTINA AUSTRALIA BRAZIL CANADA CHINA CHILE EURO INDIA INDONESIA JAPAN KOREA MALAYSIA MEXICO NORWAY NEW ZEALAND PERU PHILIPPINES SOUTH AFRICA SAUDI ARABIA SINGAPORE SWEDEN SWITZERLAND THAILAND TURKEY UNITED KINGDOM USA Empirical results 26/ 29

60 Global volatility innovations and GVAR residuals GDP α y i t-stat R 2 ARGENTINA AUSTRALIA BRAZIL CANADA CHINA CHILE EURO INDIA INDONESIA JAPAN KOREA MALAYSIA MEXICO NORWAY NEW ZEALAND PERU PHILIPPINES SOUTH AFRICA SAUDI ARABIA SINGAPORE SWEDEN SWITZERLAND THAILAND TURKEY UNITED KINGDOM USA Equity Price α eq i t-stat R 2 ARGENTINA AUSTRALIA BRAZIL CANADA CHINA CHILE EURO INDIA INDONESIA JAPAN KOREA MALAYSIA MEXICO NORWAY NEW ZEALAND PERU PHILIPPINES SOUTH AFRICA SAUDI ARABIA SINGAPORE SWEDEN SWITZERLAND THAILAND TURKEY UNITED KINGDOM USA Empirical results 26/ 29

61 Reconciling our findings with the literature In the literature identification is typically achieved through a recursive ordering of variables in a VAR framework Empirical results 27/ 29

62 Reconciling our findings with the literature In the literature identification is typically achieved through a recursive ordering of variables in a VAR framework In our factor model, these identification assumptions are equivalent to assuming that the factors n t affect both volatility and macroeconomic variables contemporaneously the macroeconomic variables ( y it ) are not allowed to affect volatility (v t ) contemporaneously Empirical results 27/ 29

63 Reconciling our findings with the literature In the literature identification is typically achieved through a recursive ordering of variables in a VAR framework In our factor model, these identification assumptions are equivalent to assuming that the factors n t affect both volatility and macroeconomic variables contemporaneously the macroeconomic variables ( y it ) are not allowed to affect volatility (v t ) contemporaneously Modified volatility module v t = Φ 1v v t 1 + Ψ 0v ȳ }{{} t + Ψ 1v ȳ t 1 Ψ 0v ζ0 }{{} + ξ 0 t =0 O p((n+1) 1/2 ) Empirical results 27/ 29

64 Modified global volatility innovations and GVAR residuals GDP β y i t-stat R 2 ARGENTINA AUSTRALIA BRAZIL CANADA CHINA CHILE EURO INDIA INDONESIA JAPAN KOREA MALAYSIA MEXICO NORWAY NEW ZEALAND PERU PHILIPPINES SOUTH AFRICA SAUDI ARABIA SINGAPORE SWEDEN SWITZERLAND THAILAND TURKEY UNITED KINGDOM UNITED STATES Empirical results 28/ 29

65 Modified global volatility innovations and GVAR residuals GDP β y i t-stat R 2 ARGENTINA AUSTRALIA BRAZIL CANADA CHINA CHILE EURO INDIA INDONESIA JAPAN KOREA MALAYSIA MEXICO NORWAY NEW ZEALAND PERU PHILIPPINES SOUTH AFRICA SAUDI ARABIA SINGAPORE SWEDEN SWITZERLAND THAILAND TURKEY UNITED KINGDOM UNITED STATES Equity Price β eq i t-stat R 2 ARGENTINA AUSTRALIA BRAZIL CANADA CHINA CHILE EURO INDIA INDONESIA JAPAN KOREA MALAYSIA MEXICO NORWAY NEW ZEALAND PERU PHILIPPINES SOUTH AFRICA SAUDI ARABIA SINGAPORE SWEDEN SWITZERLAND THAILAND TURKEY UNITED KINGDOM UNITED STATES Empirical results 28/ 29

66 Conclusions What we do A novel approach to study the interrelation between volatility and macroeconomic dynamics Results and implications Volatility shocks have no statistically significant impact on economic activity Most of the effect often found in the literature could stem from the fact that volatility is driven by the same common factors that affect the business cycle Volatility may be a symptom rather than a cause of economic instability Conclusions 29/ 29