NBER WORKING PAPER SERIES SHOCKS AND CRASHES. Martin Lettau Sydney C. Ludvigson. Working Paper
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1 NBER WORKING PAPER SERIES SHOCKS AND CRASHES Martin Lettau Sydney C. Ludvigson Working Paper NATIONAL BUREAU OF ECONOMIC RESEARCH 1050 Massachusetts Avenue Cambridge, MA April 2011 The authors are grateful to seminar participants at UC Berkeley Haas, Columbia GSB, Stanford GSB, and to Mark Gertler, Yuriy Gorodnichenko, Giorgio Primiceri, Eduard Schaal, and Gianluca Violante, for helpful discussion. We thank David Kohn, Peter Gross, and Michael Weber for excellent research assistance. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research by Martin Lettau and Sydney C. Ludvigson. All rights reserved. Short sections of text, not to exceed two paragraphs, may be quoted without explicit permission provided that full credit, including notice, is given to the source.
2 Shocks and Crashes Martin Lettau and Sydney C. Ludvigson NBER Working Paper No April 2011 JEL No. E10,E21,E27,E44,G12,G17 ABSTRACT Three shocks, distinguished by whether their effects are permanent or transitory, are identified to characterize the post-war dynamics of aggregate consumer spending, labor earnings, and household wealth. The first shock accounts for virtually all of the variation in consumption and has effects akin to a permanent total factor productivity shock in canonical frictionless macroeconomic models. The second shock underlies the bulk of fluctuations in labor income, accounting for 76% of its variation. This shock permanently reallocates rewards between shareholders and workers but leaves consumption unaffected. Over the last 25 years, the cumulative effect of this shock has persistently boosted stock market wealth and persistently lowered labor earnings. The third shock is a persistent but transitory innovation that accounts for the vast majority of quarterly fluctuations in asset values but has a negligible impact on consumption and labor earnings at all horizons. We show that the asset market crash was the result of a negative transitory wealth shock, which predominantly affected stock market wealth. By contrast, the crash was accompanied by a string of large negative realizations in both the transitory shock and the permanent productivity shock, with the latter having especially important implications for housing wealth. Martin Lettau Haas School of Business University of California, Berkeley 545 Student Services Bldg. #1900 Berkeley, CA and NBER lettau@haas.berkeley.edu Sydney C. Ludvigson Department of Economics New York University 19 W. 4th Street, 6th Floor New York, NY and NBER sydney.ludvigson@nyu.edu
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48 Table 1: Growth Rates Consumption Labor Income Financial Net Worth Std. Dev. 0.47% 0.90% 2.19% Correlations Consumption Labor Income Net Worth Notes: The table reports descriptive statistics of log first differences of consumption, labor income and financial net worth. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
49 Table 2: VECM Dependent variable Equation Δc t Δa t Δy t cay t (0.94) (2.33) (1.71) Δc t (4.82) (0.73) (3.74) Δy t (1.67) (-0.78) (-1.18) Δa t (3.92) (3.26) (1.35) R Notes: The table reports the estimated coefficients from cointegrated vector autoregressions (VECM) of the column variable on the row variable; t-statistics are in parentheses. Estimated coefficients that are significant at the 5% level are highlighted in bold face. The term c t α a a t α y y t = α x t is the estimated cointegrating residual. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
50 Table 3: Labor Income Growth Regressions Dependent Variable: Δy t Independent Variables: Δy t 1 ΔTFP t ΔLS CP t ΔLS BLS t (t-stat) (7.319) (t-stat) (8.251) (3.023) (t-stat) (9.403) (5.624) (t-stat) (-0.641) (7.054) (t-stat) (-0.532) (7.917) (2.756) (t-stat) (-0.852) (9.265) (5.824) R 2 Notes: t-statistics are obtained using Newey-West standard errors at 4 lags. Δy t is real labor income growth obtained from the CAY dataset (source: Sydney Ludvigson). ΔTFP t is TFP growth (source: FRBSF/Fernald). ΔLSt CP is log labor share growth, where labor share is measured as (compensation)/(compensation + profit). Compensation is Compensation of Employees: Wage and Salary Accruals obtained from the BEA via FRED (series: WASCUR). Profit is Corporate Profits After Tax obtained from the BEA via FRED (series: CP). ΔLS BLS is log labor share growth, where labor share is the series Nonfarm Business Sector: Labor Share obtained from the BLS via FRED (series: PRS ). The sample spans the period 1952:Q3 to 2012:Q2
51 Table 4: Wealth Components Net Worth Assets Liabilities Stock Wealth Housing Non-stock Fin. Share in Net Worth 1951Q4 2012Q Q4 1961Q Q3 2012Q Std. Dev Correlations of log growth rates Net Worth Assets Liabilities Stock Mkt. Wealth Housing Non stock Financial Notes: The table reports descriptive statistics of wealth components from the Flow of Funds. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
52 Table 5: Variance Decomposition Variable Prod. Shock Fact. Shares Shock Risk Aversion Shock Δc t+1 E t Δc t+1 100% 0% 0% (100%, 100%) (0%, 0%) (0%, 0%) Δy t+1 E t Δy t+1 16% 84% 0% (11%, 23%) (77%, 89%) (0%, 0%) Δa t+1 E t Δa t+1 7% 0% 93% (4%, 11%) (0%, 1%) (88%, 96%) Δc t+ E t Δc t+ 93% 1% 6% (87%, 96%) (0%, 4%) (3%, 11%) Δy t+ E t Δy t+ 22% 77% 1% (16%, 28%) (70%, 83%) (0%, 3%) Δa t+ E t Δa t+ 7% 3% 90% (5%, 14%) (1%, 10%) (80%, 91%) Notes: The table reports the variance decomposition of consumption, labor income and net worth. Bootstrapped 90% confidence intervals are in parentheses. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
53 Table 6: Correlation with Random Walk Component Consumption Labor Income Financial Net Worth Notes: This table reports the correlations of growth rates with the growth rates of the nonstationary random walk components constructed from the permanent/transitory identification of shocks. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
54 Table 7: Wealth Components: Variance Decomposition Wealth Component Prod. Shock Fact. Shares Shock Risk Aversion Shock Residual Net Worth 8% 4% 88% 0% Stock Mkt. Wealth 7% 6% 74% 13% Housing 20% 8% 24% 49% Non-Stock Fin. Wealth 19% 7% 24% 50% Notes: This table reports the variance decomposition of wealth components based on OLS regressions on contemporaneous and lagged shocks. The numbers are the fraction of h = step-ahead forecast error in the log difference of the variable named in the row that is attributable to the shock named in the column heading The last column reports that share of the variance that is due to the residual of the regressions. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
55 Table 8: Impulse Response Function with 90% Confidence Intervals Horizon Consumption h Prod. Shock Fact. Shares Shock Risk Aversion Shock (0.371, 0.424) ( 0.000, 0.000) (0.000, 0.000) (0.600, 0.770) (-0.011, 0.093) (0.108, 0.234) (0.618, 0.831) (-0.056, 0.078) (0.097, 0.237) (0.628, 0.852) (-0.096, 0.064) (0.075, 0.220) (0.633, 0.868) (-0.132, 0.056) (0.056, 0.207) (0.650, 1.041) (-0.386, 0.004) (0.000, 0.113) Horizon Labor Income h Prod. Shock Fact. Shares Shock Risk Aversion Shock (0.264, 0.434) (0.717, 0.838) (0.000, 0.000) (0.533, 0.821) (0.623, 0.808) (0.061, 0.242) (0.558, 0.878) (0.591, 0.790) (0.064, 0.241) (0.568, 0.895) (0.558, 0.773) (0.052, 0.220) (0.575, 0.907) (0.526, 0.765) (0.040, 0.203) (0.601, 1.045) (0.316, 0.718) (0.000, 0.096) Horizon Net Worth h Prod. Shock Fact. Shares Shock Risk Aversion Shock (0.396, 0.712) (-0.199, 0.166) (1.847, 2.160) (0.503, 1.262) (-0.812, ) (1.925, 2.681) (0.583, 1.575) (-1.377, ) (1.434, 2.545) (0.626, 1.852) (-1.866, ) (1.036, 2.444) (0.646, 2.102) (-2.265, ) (0.742, 2.370) (0.669, 4.454) (-5.232, ) (0.001, 1.487) Notes: This table reports impulse response functions of consumption, labor income and net worth. Bootstrapped 90% confidence intervals are in parentheses. The sample spans the fourth quarter of 1951 to the third quarter quarter of 2012.
56 Figure 1: BLS Labor Share Notes: The figure plots the labor share constructed by the Bureau of Labor Statistics. The series is normalized to 100 in 2005Q1. The sample is 1952:Q1 to 2012:Q3.
57 Figure 2: Productivity Shock and TFP Shock Notes: The figures shows 4-year moving averages of the permanent productivity shock and TFP shocks. The TFP data are from Fernald (2009). Both series are divided by their standard deviations. The sample is 1952:Q1 to 2012:Q3.
58 Figure 3: Impulse Response Functions in RBC Model 1 Sigma = c t w t k t Quarters 1 Sigma = c t w t k t Quarters 1 Sigma = c t w t k t Quarters Notes: Percentage response of consumption, capital and labor income, corresponding to a 1% technology shock in a model with fixed labor supply (normalized to one), specified in the following equations: Y t = A α t Kt 1 α ; K t+1 =(1 δ)k t + Y t C t ; C γ t = βe t {C γ t+1 R t+1}; a t = φa t 1 + ɛ t. Lowercase letters denote log levels. w t is log labor income (equal to real wage since labor supply is fixed at unity), c t is log real consumption and k t is log capital. The parameter values are set as follows: φ =1,r =0.015, g =0.005, α =0.667, δ =0.025 and σ =1/γ.
59 Figure 4: Impulse Response Functions Notes: The figure plots impulse response functions. The sample is 1952:Q1 to 2012:Q3.
60 Figure 5: Cumulative Shocks Notes: The figure plots cumulative permanent and transitory shocks identified by the PT decomposition. The sample is 1952:Q1 to 2012:Q3.
61 Figure 6: Cyclical Component of Net Worth Notes: The figure plots log, per capita asset wealth minus its random walk component, in percent of the random walk component. The sample is 1952:Q1 to 2012:Q3.
62 Figure 7: PT Decomposition of Constantinides Habit Model Impulse Response Permanent Shock in Constandinidis Model consumption (83%) wealth (95%) Impulse Response Years Temporary Shock in Constandinidis Model consumption (17%) wealth (5%) Years Notes: The figure plots impulse response functions of consumption and wealth to permanent and transitory shocks in simulated data from Constantinides (1990) habit model. The numbers in the legend are the fraction of the forecast error variance explained by the permanent and transitory shocks.
63 Figure 8: PT Decomposition of Campbell Cochrane Habit Model Notes: The figure plots the impulse response functions of consumption and wealth to permanent and transitory shocks computed from simulated data of the Campbell and Cochrane (1999) habit model. The numbers in the legend are the fraction of the forecast error variance explained by the permanent and transitory shocks.
64 Figure 9: Impulse Response Functions Notes: The figure plots impulse response functions of wealth components to permanent and transitory shocks. The sample is 1952:Q1 to 2012:Q3.
65 Figure 10: Impulse Response Functions to Factor Shares Shock Shock Notes: The figure plots impulse response functions of stock market wealth and labor income to a factor shares shock shock. The sample is 1952:Q1 to 2012:Q3.
66 Figure 11: VECM Level Decomposition - Consumption Notes: The figure shows the decomposition of the log level of consumption into components driven by the productivity, factor shares, and risk aversion shocks, over time. A linear time trend is removed. The sample is 1952:Q1 to 2012:Q3.
67 Figure 12: VECM Level Decomposition - Net Worth Notes: The figure shows the decomposition of the log level of net worth into components driven by the productivity, factor shares, and risk aversion shocks, over time. A linear time trend is removed. The sample is 1952:Q1 to 2012:Q3.
68 Figure 13: VECM Level Decomposition - Labor Income Notes: The figure shows the decomposition of the log level of labor income into components driven by the productivity, factor shares, and risk aversion shocks, over time. A linear time trend is removed. The sample is 1952:Q1 to 2012:Q3.
69 Figure 14: Level Decomposition Notes: The figure shows the decomposition of the log level of stock wealth, housing wealth, and nonstock financial wealth into components driven by the productivity, factor shares, and risk aversion shocks, over time. A linear time trend is removed. The sample is 1952:Q1 to 2012:Q3.
70 Figure 15: Decomposition of Labor Income and Stock Market Wealth Notes: The figure shows the component of the log levels of stock market wealth and labor income that is attributable the cumulative effects of the factor shares shock, over time. Both series are divided by their standard deviations. The sample is 1952:Q1 to 2012:Q3.
71 Figure 16: Decomposition of Spectra Notes: The figure shows the decomposition of spectra at different frequencies. Spectra are estimated in first differences and converted into spectra for levels: S x (ω) =(1 exp( iω)) 1 (1 exp(iω)) 1 S Δx. The sample is 1952:Q1 to 2012:Q3.
72 Figure 17: Decomposition of Spectrum Notes: The figure shows the decomposition of spectra at different frequencies. Spectra are estimated in first differences and converted into spectra for levels: S x (ω) =(1 exp( iω)) 1 (1 exp(iω)) 1 S Δx. The sample is 1952:Q1 to 2012:Q3.
73 Figure 18: VECM Level Decomposition - Net Worth: Subsample 1994:Q1-2012:Q3 Notes: The figure shows the decomposition of the log level of net worth into components driven by the productivity, factor shares, and risk aversion shocks for the 1994:Q2-2000:Q4 subsample. The vertical lines divide the sample into two boom periods (1994:Q2 to 2000:Q1 and 2002:Q4 to 2007:Q3) and two bust periods (2000:Q2 to 2002:Q3 and 2007Q4 to 2012:Q3). A linear time trend is removed.
74 Figure 19: OLS Level Decomposition - Stock Market Wealth: Subsample 1994:Q1-2012:Q3 Notes: The figure shows the decomposition of the log level of stock market wealth into components driven by the productivity, factor shares, and risk aversion shocks for the 1994:Q2-2000:Q4 subsample. The vertical lines divide the sample into two boom periods (1994:Q2 to 2000:Q1 and 2002:Q4 to 2007:Q3) and two bust periods (2000:Q2 to 2002:Q3 and 2007Q4 to 2012:Q3). A linear time trend is removed.
75 Figure 20: OLS Level Decomposition - Housing Wealth: Subsample 1994:Q1-2012:Q3 Notes: The figure shows the decomposition of the log level of housing wealth into components driven by the productivity, factor shares, and risk aversion shocks for the 1994:Q2-2000:Q4 subsample. The vertical lines divide the sample into two boom periods (1994:Q2 to 2000:Q1 and 2002:Q4 to 2007:Q3) and two bust periods (2000:Q2 to 2002:Q3 and 2007Q4 to 2012:Q3). A linear time trend is removed.
76 Figure 21: OLS Level Decomposition - Non-Stock Financial Wealth: Subsample 1994:Q1-2012:Q3 Notes: The figure shows the decomposition of the log level of non-stock financial wealth into components driven by the productivity, factor shares, and risk aversion shocks for the 1994:Q2-2000:Q4 subsample. The vertical lines divide the sample into two boom periods (1994:Q2 to 2000:Q1 and 2002:Q4 to 2007:Q3) and two bust periods (2000:Q2 to 2002:Q3 and 2007Q4 to 2012:Q3). A linear time trend is removed.
77 Figure 22: IRF of Investment to Shocks Notes: The figure plots impulse response functions of different measures of (log level) investment in response to the productivity, factor shares and risk aversion shocks. The sample is 1952:Q1 to 2012:Q3.
78 Figure 23: IRF of Uncertainty to Factor Shares Shock Notes The figure plots impulse responses of different measures of aggregate uncertainty from Jurado, Ludvigson, and Ng (2013) in response to the factor shares shock. The top panel plots the response of common firm-level uncertainty factors for uncertainty horizons h=1 quarter and h=4 quarters. The bottom panel plots the response of common macro uncertainty factors for the same uncertainty horizons.
22 .5 Real consumption.5 Real residential investment.5.5.5 965 975 985 995 25.5 965 975 985 995 25.5 Real house prices.5 Real fixed investment.5.5.5 965 975 985 995 25.5 965 975 985 995 25.3 Inflation
Διαβάστε περισσότερα.5 Real consumption.5 Real residential investment.5.5.5 965 975 985 995 25.5 965 975 985 995 25.5 Real house prices.5 Real fixed investment.5.5.5 965 975 985 995 25.5 965 975 985 995 25.3 Inflation rate.3
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