Credit frictions and the comovement between durable and non-durable consumption

Frictions in lending between households have been proposed as a solution to the difficulties new-Keynesian models have in predicting a decline in both durable and non-durable consumption following a monetary tightening. By revisiting a standard new-Keynesian framework with collateral constraints, it is shown that the presence of such credit frictions in fact makes it more difficult to generate the joint decline. The intuitive reasons behind this result are provided, which should be helpful in developing models that are more successful in generating a positive comovement between durables and non-durables.     

The Role of Durables Replacement and Second‐Hand Markets in a Business‐Cycle Model

Transactions of used durables are large and cyclical, but their interaction with purchases of new durables has been neglected in business‐cycle studies. I fill this gap by introducing a new business‐cycle model of consumer durables where households resell their goods on the second‐hand market and the production of new durables is affected by the supply of used goods. The model delivers three conclusions: Markups are smaller for goods that are more durable and more frequently replaced; markups are countercyclical for durables, resolving the comovement puzzle of Barsky, House, and Kimball (2007); and procyclical replacement demand amplifies durables spending.     

Durables, nondurables, down payments and consumption excesses

We examine a model that generalizes the standard buffer-stock model of saving to accommodate durables, nondurables, down payment requirements, and adjustment costs in the durables market. We find that nondurable consumption becomes more volatile relative to income as down payments decrease at the individual and at the aggregate level. Moreover, for plausible parameter values, the model can explain the excess smoothness and excess sensitivity observed in U.S. aggregate data. The result follows from a gradual adjustment of consumption to permanent income shocks when agents attempt to spread out the burden of down payments over time, compounded by slow adjustment due to transaction costs.     

Sectoral Comovement,Monetary Policy Shocks,and Input–Output Structure

The comovement of output across the sector producing nondurables (i.e., nondurable goods and services) and the sector producing durables is well established in the monetary business cycle literature. However, standard sticky‐price models that incorporate sectoral heterogeneity in price stickiness (i.e., sticky nondurables prices and flexible durables prices) cannot generate this feature. We argue that an input–output (I–O) structure provides a solution to this problem. Here, we develop a two‐sector model with an I–O structure, which is calibrated to the U.S. economy. In the model, each sector’s output affects those of the others by acting as an intermediate input. This connection between the sectors provides a channel through which sectoral comovement is induced.     

Testing the CAPM with broader market indexes: A problem of mean-deficiency

This study addresses a problem that can arise when a broader market index is used to test the CAPM: a return series used in the index can exclude part of an asset's return. If the excluded return is constant, then a test of mean-variance efficiency can be constructed, but an additional parameter must be estimated. This point is illustrated in tests with both broader market indexes and stocks-only indexes. The broader indexes exclude the rental return on real estate and durables. The excluded rental return is estimated under the assumption that the index portfolio is mean-variance efficient.     

New Keynesian models, durable goods, and collateral constraints

Econometric evidence suggests that, in response to monetary policy shocks, durable and non-durable spending co-move positively, and durable spending exhibits a much larger sensitivity to the shocks. A standard two-sector New Keynesian model with perfect financial markets is at odds with these facts. The introduction of a borrowing constraint, where durables play the role of collateral assets, helps in reconciling the model with the empirical evidence.     

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.     

Energy Price Shocks and the Macroeconomy: The Role of Consumer Durables

We create a model with a distinction between investment in consumer durables and capital goods, as well as energy use by households and firms, to evaluate the importance of energy price shocks for output fluctuations. Simulation results indicate that this economy has a smaller proportion of output fluctuations attributable to energy price shocks than one without durable goods and household energy use. We show that an energy price hike is absorbed by reducing investment in durables more than in fixed capital. This rebalancing effect cushions the hit to future production. Thus, productivity shocks remain the prime driver for output fluctuations.     

Measuring uncertainty based on rounding: New method and application to inflation expectations

The literature on cognition and communication documents that people use round numbers to convey uncertainty. This paper introduces a method of quantifying the uncertainty associated with round responses in pre-existing survey data. I construct micro-level and time series measures of inflation uncertainty since 1978. Inflation uncertainty is countercyclical and correlated with inflation disagreement, volatility, and the Economic Policy Uncertainty index. Inflation uncertainty is lowest among high-income consumers, college graduates, males, and stock market investors. More uncertain consumers are more reluctant to spend on durables, cars, and homes. Round responses are common on many surveys, suggesting numerous applications of this method.     

Equilibrium traits of durable commodity money

A dynamic model of utility-maximizing agents explains why scarce, durable commodities are typically monetary. The model provides quantitative criteria for distinguishing between monetary and non-monetary durables, and is also used to analyze symmetallic equilibria.The model is then extended to analyze commodity-backed paper money. It is demonstrated that the backing generates trust in the paper money in the dynamic-consistency sense. The model predicts regular devaluations as an equilibrium phenomenon, but finds such behavior to be efficient. Finally, the results are integrated to make a technical point about dynamic models of pure fiat money.     

Inequality and the US import demand function

In this paper we investigate the empirical importance of changes in inequality on the demand for imports by examining US data from 1948 to 2007. We find evidence of a long-run relationship of a standard imports equation including income inequality. The existence of a cointegrating equation in imports, income, relative prices and inequality exists not only for aggregate real imports but also for more disaggregated categories as well. The evolution of inequality seems to have a large and positive influence on the demand for imports in the US with the exception of imports of services whereas the impact of inequality on imports of durables is more ambiguous. Our results are robust to alternative methods of estimating cointegration equations.     

Substitution between monetary assets and consumer goods: New evidence on the monetary transmission mechanism

This paper presents important new evidence on the monetary transmission mechanism in the context of the degree of substitution across UK monetary assets and consumption goods. Specifically, our empirical results show that durable goods expenditures are a relatively powerful element of the monetary transmission mechanism with semi-durables consumption having a somewhat smaller impact. Our results also provide an explanation for the “puzzle” that the nominal expenditure share of durables has remained relatively stable in recent years while the real expenditure share has increased dramatically. In addition, this paper demonstrates that the potential bias in substitution estimates from using artificial break-adjusted monetary data can be reduced by using the relatively new non-break adjusted monetary data produced by the Bank of England.     

Mixed Integer Programming Revealed Preference Tests of Utility Maximization and Weak Separability of Consumption,Leisure, and Money

Swofford and Whitney (1987, 1988, 1994) investigated the validity of two key assumptions underlying representative agent models of macroeconomics. These assumptions are utility maximization and weak separability. Using mixed integer programming, we check revealed preference conditions for these assumptions. We find that M1, money defined by Friedman and Schwartz (1963), and a broad aggregate are weakly separable. We find that consumption goods and leisure and nondurables and services are weakly separable. We find that M2, M3, and MZM are not weakly separable. Finally, we find three categories of consumption, durables, nondurables and services, do not form an aggregate.     

On the Intertemporal Elasticity of Substitution under Nonhomothetic Utility

In this note, we use a model with nonseparable and nonhomothetic preferences to estimate the intertemporal elasticity of substitution (IES). We show that, while the homothetic utility model may induce a bias that increases the elasticity of substitution between nondurables and durables, the estimated IES remains positive and significant.     

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。     

Testing the cross-section implications of Friedman's permanent income hypothesis

We use modern household data and econometric methods to conduct some of the original tests of the permanent income hypothesis (PIH) suggested and used by Friedman [1957. A Theory of the Consumption Function. Princeton University Press, Princeton]. The data and methods are superior to those available to Friedman, allowing us to refine Friedman's tests and perform tests he could not do. The results provide overall though not universal support for PIH.     

Oil Price Uncertainty

The theories of investment under uncertainty and real options predict that uncertainty about, for example, oil prices will tend to depress current investment. We reinvestigate the relationship between the price of oil and investment, focusing on the role of uncertainty about oil prices. We find that volatility in oil prices has had a negative and statistically significant effect on several measures of investment, durables consumption, and aggregate output. We also find that accounting for the effects of oil price volatility tends to exacerbate the negative dynamic response of economic activity to a negative oil price shock, while dampening the response to a positive oil price shock.     

The Term Structure as a Predictor of Real Economic Activity

A positive slope of the yield curve is associated with a future increase in real economic activity: consumption (nondurables plus services), consumer durables, and investment. It has extra predictive power over the index of leading indicators, real short-term interest rates, lagged growth in economic activity, and lagged rates of inflation. It outperforms survey forecasts, both in-sample and out-of-sample. Historically, the information in the slope reflected, inter alia, factors that were independent of monetary policy, and thus the slope could have provided useful information both to private investors and to policy makers.     

How sensitive are consumer expenditures to retail energy prices?

There is growing evidence that the primary effect of energy price shocks on the U.S. economy involves a reduction in consumer spending. We quantify the direct effect on real consumption of unanticipated changes in discretionary income, shifts in precautionary savings, and changes in the operating cost of energy-using durables. The possibility of asymmetries in the response of real consumption to energy price shocks is also considered. We demonstrate that linear models are consistent with the symmetric behavior of real consumption in 1979 (when energy prices increased sharply) and in 1986 (when they fell sharply). It is shown that historically energy price shocks have been an important factor in explaining U.S. real consumption growth, but by no means the dominant factor.     

On the exclusion of assets from tests of the two-parameter model: A sensitivity analysis

This study investigates the sensitivity of tests of the CAPM to different sets of asset returns. Tests are conducted with market portfolios that include returns for bonds, real estate, and consumer durables in addition to common stocks. Even when stocks represent only 10% of the portfolio's value, inferences about the CAPM are virtually identical to those obtained with a stocks-only portfolio. In contrast, inferences are sensitive to the set of assets used in the tests.