Demand and productivity components of business cycles: Estimates and implications

Standard stochastic growth models provide theoretical restrictions on output decomposition which can be used to investigate whether productivity shocks played a major role in observed business cycles. Applying these restrictions to US data leads to the following findings: (i) Business cycles implied by productivity shocks are mildly correlated to overall fluctuations and help account for a few episodes of US postwar recessions. However, only 20% of US fluctuations can be explained by these shocks. (ii) Most fluctuations seem instead to be due to “nominal demand” shocks, i.e. shocks which move output and prices in the same direction, but whose effects on output are ultimately transitory. (iii) Canonical sticky price models in the new-neoclassical synthesis tradition can account for the cyclical comovements of output and prices, but canonical, frictionless, RBC models cannot.     

Consumption heterogeneity,employment dynamics and macroeconomic co-movement

Real-business-cycle models rely on total factor productivity (TFP) shocks to explain the observed co-movement among consumption, investment and hours. However an emerging body of evidence identifies “investment shocks” as important drivers of business cycles. This paper shows that a neoclassical model consistent with observed heterogeneity in labor supply and consumption across employed and non-employed can generate co-movement in response non-TFP shocks. Estimation reveals fluctuations in the marginal efficiency of investment that explain the bulk of business-cycle variance in consumption, investment and hours. A corollary of the model׳s empirical success is the labor wedge that is not important at business-cycle frequencies.     

News shocks and business cycles

This paper proposes and implements a novel structural VAR approach to the identification of news shocks about future technology. The news shock is identified as the shock orthogonal to the innovation in current utilization-adjusted TFP that best explains variation in future TFP. A favorable news shock leads to an increase in consumption and decreases in output, hours, and investment on impact - more suggestive of standard DSGE models than of recent extensions designed to generate news-driven business cycles. Though news shocks account for a significant fraction of output fluctuations at medium frequencies, they contribute little to our understanding of recessions.     

Durable Goods,Investment Shocks,and the Comovement Problem

Sticky‐price models suggest that capital investment shocks are an important driver of business cycle fluctuations. Despite quantitative importance in explaining business cycles, a comovement problem emerges because the shocks generate intertemporal substitution effects away from consumption toward investment. This paper resolves the problem by extending the standard sticky‐price model to a two‐sector model with consumer durable services. When durable goods are used as investment in capital and consumer durables, positive capital investment shocks also generate intratemporal substitution effects away from consumer durable services toward nondurable consumption that dominates intertemporal effects. Consequently, consumption increases, and the comovement problem is resolved.     

Durable goods,financial frictions,and business cycles in emerging economies

Business cycles in emerging economies display very volatile consumption and strongly countercyclical trade balance. We show that aggregate consumption in these economies is not more volatile than output once durables are accounted for. Then, we present and estimate a real business cycles model for a small open economy that accounts for this empirical observation. Our results show that the role of permanent shocks to aggregate productivity in explaining cyclical fluctuations in emerging economies is considerably lower than previously documented. Moreover, we find that financial frictions are crucial to explain some key business cycle properties of these economies.     

Heterogeneous Consumers and Fiscal Policy Shocks

This paper studies empirical facts regarding the effects of unexpected changes in aggregate macroeconomic fiscal policies on consumers that differ depending on individual characteristics. We use data from the Consumption Expenditure Survey to estimate individual‐level responses and multipliers for government spending. We find that unexpected fiscal shocks have substantially different effects on consumers depending on their income and age levels: the wealthiest individuals tend to behave according to predictions of standard Real Business Cycle (RBC) models, whereas the poorest ones behave according to standard IS–LM (non‐Ricardian) models, most likely due to credit constraints. Furthermore, government spending policy shocks tend to decrease consumption inequality.     

A model of the Federal Reserve Act under the international gold standard system

Freeman (Am. Econom. Rev. 86 (1996a) 1126) shows that an elastic money supply enhances the efficiency of monetary equilibrium by clearing default-free debts at par value in the domestic credit market. This research adds a foreign exchange market to Freeman's model and extends his analysis into a two-country model, in which the arrival rates of agents are not equal between the two countries. In this model, an elastic money supply in the foreign exchange market to clear the exchange of fiat monies at gold standard parity, accompanied by an elastic money supply in the domestic credit market, could improve the efficiency of monetary equilibrium.     

Asymmetric business cycles: Theory and time-series evidence

We offer a theory of economic fluctuations based on intertemporal increasing returns: agents who have been active in the past face lower costs of action today. This specification explains the observed persistence in individual and aggregate output fluctuations even in the presence of i.i.d shocks because individuals respond to the same shock differently depending on their recent past experience. The exact process for output, the sharpness of turning points and the degree of asymmetry are determined by the form of heterogeneity. Our general formulation, under certain assumptions, reduces to a number of popular state space (unobserved components) models. We find that on US data our general formulation performs better than many of the existing econometric models, largely because it allows sharper downturns and more pronounced asymmetries than linear models, and is smoother than discrete regime shift models. Our estimates imply that only modest intertemporal returns are needed for our model to explain US GNP, and that heterogeneity across agents plays an important role in the propagation of business cycle shocks.     

Tax Evasion,Investment Shocks,and the Consumption Puzzle: A DSGE Analysis with Financial Frictions

Recent studies identify Marginal Efficiency of Investment (MEI) shocks as important drivers of the business cycle. However, Dynamic Stochastic General Equilibrium (DSGE) models struggle to explain macroeconomic comovements between consumption and the key real variables after a MEI shock. Moreover, engaging in tax evasion practices is often an answer to financial constraints, which have been recognized as important determinants of cyclical fluctuations as well. We use a medium-scale New Keynesian DSGE model, that combines tax evasion with financial frictions, to simulate a MEI shock. We show that entrepreneurial tax evasion can solve the comovement problem to a fair extent.     

耐用品、投资专有冲击与货币政策福利

本文构建蕴含耐用品与非耐用品的两部门DSGE模型,研究投资专有冲击对货币政策及社会福利的影响。投资专有技术进步改进了投资转化为生产资本的效率,放大边际成本波动,增加了厂商调价动机和价格水平变动。即使耐用品价格完全灵活,最优货币政策也无法同时稳定价格和实际GDP。研究发现:(1)耐用品相对价格缺口波动率的上升虽然增加了实际GDP波动,但能够有效地降低投资专有技术对边际成本的冲击,减少价格变动的福利损失。所以两部门投资专有冲击时,央行倾向于稳定价格水平。与其相反,在单部门投资专有冲击和两部门生产技术冲击时,最优货币政策应降低耐用品相对价格缺口波动,稳定实际GDP。(2)对比三种泰勒规则:钉住非耐用品PPI、钉住加权平均PPI及钉住CPI,福利分析发现钉住非耐用品PPI最优,钉住CPI次之,钉住加权平均PPI的福利损失最大。就损失程度而言,投资专有冲击的福利损失是生产技术冲击的2倍,表明投资专有冲击加剧了最优货币政策在稳定价格与实际GDP间的权衡。     

Flexible Prices and the Business Cycle

Business cycles models with flexible prices face two major empirical challenges. One regards observed output dynamics: the positive, short run, autocorrelation in GNP growth, and the hump‐shaped, trend‐reverting output response to transitory shocks ( Cogley and Nason 1995 ). The other regards the alleged persistent decline in employment following a positive technology shock ( Galí 1999 ). No determinate model with flexible prices has so far been able to address all of the Cogley Nason–Galí challenges. We show that the standard RBC model can do so if it contains a signal extraction problem involving permanent and temporary supply shocks.     

Currency Returns, Intrinsic Value, and Institutional-Investor Flows

We decompose currency returns into (permanent) intrinsic‐value shocks and (transitory) expected‐return shocks. We explore interactions between these shocks, currency returns, and institutional‐investor currency flows. Intrinsic‐value shocks are: dwarfed by expected‐return shocks (yet currency returns overreact to them); unrelated to flows (although expected‐return shocks correlate with flows); and related positively to forecasted cumulated‐interest differentials. These results suggest flows are related to short‐term currency returns, while fundamentals better explain long‐term returns and values. They also rationalize the long‐observed poor performance of exchange‐rate models: by ignoring the distinction between permanent and transitory exchange‐rate changes, prior tests obscure the connection between currencies and fundamentals.     

A present value test of habits and the current account

Forecasts derived from standard intertemporal current account (ICA) models generally fail to match the volatility of actual current accounts. This paper offers a solution to the “excess volatility” problem of standard ICA models by incorporating consumption habits into the standard model. The model, as developed in the paper, shows that significant habit formation implies increased current account volatility, as sluggishness is introduced into the consumption adjustment process that follows income shocks. A theory-consistent measure of the degree of habit formation is estimated using GMM. The estimated habit parameter is found to be statistically significant in six of eight quarterly samples.     

中国信贷市场利率与经济波动:2004-2010

本文基于VAR和VEC模型对我国信贷市场利率与经济波动的关系进行实证分析。研究结果表明:(1)投资、消费对于信贷市场利率的冲击处于负的脉冲响应,投资的响应更显著。投资、消费对信贷市场利率的影响非常有限。(2)投资波动对产出波动起主要作用;产出对投资波动和消费波动的影响程度有限;(3)信贷市场利率与投资、消费、产出之间存在长期均衡关系。基于这些分析结论,文章提出若干政策建议。     

Financial integration, information and communication technology, and macroeconomic volatility: Evidence from ten Asian economies

This paper aims to examine the impact of financial integration and information and communication technology (ICT) development on output volatility. It applies a two-country dynamic general equilibrium model, in which ICT is assumed to increase the volume and speed of capital flows. This model predicts that economies with a high ICT development or/and a high degree of financial integration exhibit greater output fluctuations in the face of monetary policy shocks, but lower output fluctuations in the face of fiscal policy shocks. The empirical findings estimated by using the panel vector autoregression approach and impulse response analysis support these predictions.     

银行体系、技术冲击与中国宏观经济波动

本文运用新凯恩斯的DSGE模型研究金融效率、经济结构变化对技术冲击效应的影响。研究结果印证了传统经济周期理论的核心观点,即技术进步不仅可以刺激产出、消费和投资,还可以降低社会总体价格水平,而金融中介效率、资本收入份额和折旧率的高低都不会影响技术冲击的传导路径。同时,本文的研究还显示,作为金融中介的银行体系效率越高,技术冲击对宏观经济波动的影响越小。该结论意味着,在当前阶段我国应着力提高国内金融体系的效率,以保证宏观经济的平稳健康运行。     

Heterogeneous life-cycle profiles, income risk and consumption inequality

Was the increase in income inequality in the US due to permanent shocks or merely to an increase in the variance of transitory shocks? The implications for consumption and welfare depend crucially on the answer to this question. We use Consumer Expenditure Survey (CEX) repeated cross-section data on consumption and income to decompose idiosyncratic changes in income into predictable life-cycle changes, transitory and permanent shocks and estimate the contribution of each to total inequality. Our model fits the joint evolution of consumption and income inequality well and delivers two main results. First, we find that permanent changes in income explain all of the increase in inequality in the 1980s and 1990s. Second, we reconcile this finding with the fact that consumption inequality did not increase much over this period. Our results support the view that many permanent changes in income are predictable for consumers, even if they look unpredictable to the econometrician, consistent with models of heterogeneous income profiles.     

Uncertainty,Time‐Varying Fear,and Asset Prices

I construct an equilibrium model that captures salient properties of index option prices, equity returns, variance, and the risk‐free rate. A representative investor makes consumption and portfolio choice decisions that are robust to his uncertainty about the true economic model. He pays a large premium for index options because they hedge important model misspecification concerns, particularly concerning jump shocks to cash flow growth and volatility. A calibration shows that empirically consistent fundamentals and reasonable model uncertainty explain option prices and the variance premium. Time variation in uncertainty generates variance premium fluctuations, helping explain their power to predict stock returns.     

Cointegrated TFP processes and international business cycles

A puzzle in international macroeconomics is that real exchange rates are highly volatile. Standard international real business cycle (IRBC) models cannot reproduce this fact. This paper provides evidence that TFP processes for the U.S. and the “rest of the world” are characterized by a vector error correction model (VECM) and that adding cointegrated technology shocks to the standard IRBC model helps to explain the observed high real exchange rate volatility. Also, the model can explain the observed increase in real exchange rate volatility with respect to output in the last 20 years by changes in the parameters of the VECM.     

Inflation dynamics: A cross-country investigation

We document that “persistent and lagged” inflation (with respect to output) is a world-wide phenomenon in that these short-run inflation dynamics are highly synchronized across countries. In particular, the average cross-country correlation of inflation is significantly and systematically stronger than that of output, while the cross-country correlation of money growth is essentially zero. We investigate whether standard monetary models driven by monetary shocks are consistent with the empirical facts. We find that neither the new Keynesian sticky-price model nor the sticky-information model can fully explain the data. An independent contribution of the paper is to provide a simple solution technique for solving general equilibrium models with sticky information.