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The optimality of tax smoothing is reexamined using frictional labor markets. In a calibrated matching model that generates empirically relevant labor market fluctuations conditional on exogenous fiscal policy, the Ramsey-optimal policy calls for extreme labor tax rate volatility. Purposeful tax volatility induces dramatically smaller, but efficient, fluctuations of labor markets by keeping distortions constant over the business cycle. We relate the results to standard Ramsey theory by developing welfare-relevant concepts of efficiency and distortions based on primitive matching frictions. Although the basic Ramsey principles of “wedge smoothing” and zero intertemporal distortions hold, tax smoothing depends on whether wages are set efficiently.

We present a model in which some goods trade in \"customer markets\" and advertising facilitates long-lived relationships. We estimate the model on U.S. data and find a large congestion externality in the pricing of customer market goods. This motivates the analysis of optimal policy. Under a complete set of taxes, fiscal policy eliminates the externalities with large adjustments in tax rates on customer markets goods, while labor tax volatility remains low. Constraining the instruments to the interest rate and labor tax, the optimal labor tax displays large and procyclical fluctuations, but monetary policy is little changed compared to a model with no customer markets.

This article characterizes efficient labor market allocations in a labor selection model. The model's crucial aspect is cross-sectional heterogeneity for new job contacts, which leads to an endogenous selection threshold for new hires. With cross-sectional dispersion calibrated to microeconomic data, 40% of empirically relevant fluctuations in the job-finding rate arise, which contrasts with results in an efficient search and matching economy. The efficient selection model's results hold in partial and general equilibrium, as well as with sequential search.

We identify the main shock driving fluctuations in long-horizon productivity expectations, consistent with theories of TFP news. The identified shock induces strong comovement patterns in output, consumption, investment, employment, and stock prices even though TFP does not change significantly for more than 2 years. A labor search model in which wages are determined by a cash-flow sharing rule, rather than the present value of match surplus, matches the observed responses to the news shock. The model also matches the empirical patterns of vacancies, labor force participation, hours, and job-finding rates. The proposed wage rule is consistent with empirical responses of wages to both anticipated and unanticipated productivity changes.

I demonstrate that the precise timing of financial markets and goods markets in a simple cash good/credit good model does not matter for the main results in the Ramsey literature on optimal fiscal and monetary policy. In Ramsey models based on Lucas and Stokey [Journal of Monetary Economics 12, 55–93 (1983)] and Chari, Christiano, and Kehoe [Journal of Money, Credit, and Banking 23, 519–539 (1991)], nominal money holdings are freely adjustable in response to shocks in the period in which they will be used to purchase consumption. In contrast, under Svensson [Journal of Political Economy 93, 919–944 (1985)] timing, nominal balances cannot be adjusted in the period they will be used. The broad finding is that benchmark Ramsey results are not very sensitive to this slight, ultimately ad hoc, modification. In particular, optimal inflation continues to display very high variability just as in the original models, although this can differ depending on exactly which exogenous processes are driving the economy. That the basic results in the Ramsey literature are not sensitive to the choice of cash/credit timing is reassuring as Ramsey analysis is applied to an ever-expanding set of model environments.

We identify the main shock driving the covariance of the labor market and output. The shock drives strong business cycle comovement among output, consumption, investment, hours, and stock prices but is essentially orthogonal to business cycle fluctuations in TFP. Yet, the shock is associated with future persistent TFP fluctuations, consistent with theories of technology news. A standard labor search model in which wages are determined by a cash flow sharing rule, rather than the net present value of match surplus, matches the observed responses to TFP news. The response of the wage implied by this rule is consistent with the empirical responses of a broad panel of wage series

This paper characterizes long-run and short-run optimal fiscal policy in the labor selection framework. In a calibrated non-Ramsey decentralized equilibrium, labor market volatility is inefficient. Keeping fixed the structural parameters, the Ramsey government achieves efficient labor market volatility; doing so requires labor-income tax volatility that is orders of magnitude larger than the \"tax-smoothing\" results based on Walrasian labor markets, but a few times smaller than the results based on search and matching markets. We analytically characterize selection-model-consistent wedges and inefficiencies in order to understand optimal tax volatility.

This paper characterizes long-run and short-run optimal fiscal policy in the labor selection framework. In a calibrated non-Ramsey decentralized equilibrium, labor market volatility is inefficient. Keeping fixed the structural parameters, the Ramsey government achieves efficient labor market volatility; doing so requires labor-income tax volatility that is orders of magnitude larger than the \"tax-smoothing\" results based on Walrasian labor markets, but a few times smaller than the results based on search and matching markets. We analytically characterize selection-model-consistent wedges and inefficiencies in order to understand optimal tax volatility.

I characterize cyclical fluctuations in the cross-sectional dispersion of firm-level productivity in the U.S. manufacturing sector. Using the estimated dispersion, or \"risk,\" stochastic process as an input to a baseline DSGE financial accelerator model, I assess how well the model reproduces aggregate cyclical movements in the financial conditions of U.S. non-financial firms. In the model, risk shocks calibrated to micro data induce large and empirically-relevant fluctuations in leverage, a nancial measure typically thought to be closely associated with real activity. In terms of aggregate quantities, however, pure risk shocks account for only a small share of GDP fluctuations in the model, less than one percent. Instead, it is standard aggregate productivity shocks that explain virtually all of the model's real fluctuations. These results reveal a dichotomy at the core of a popular class of DSGE financial frictions models: risk shocks induce large financial fiuctuations, but have little effect on aggregate quantity fluctuations.

We study Ramsey-optimal fiscal policy in an economy in which product creation is the result of forward-looking investment decisions by firms. There are two main results. First, depending on the particular form of variety aggregation, firms' dividend payments may be either subsidized or taxed in the long run. This policy balances monopoly incentives for product creation with the welfare benefit of product variety. In the most empirically relevant form of variety aggregation, socially efficient outcomes entail a substantial tax on dividend income, removing the incentive for over-accumulation of capital, which takes the form of the stock of products. Similar intuitions determine the optimal setting of long-run producer entry subsidies. Second, optimal policy induces dramatically smaller, but efficient, fluctuations of both capital and labor markets than in a calibrated exogenous policy. Decentralization requires zero intertemporal distortions and constant static distortions over the cycle. The results relate to Ramsey theory, which we show by developing welfare-relevant concepts of efficiency that take into account product creation. The results on optimal entry subsidies provide guidance for the study of product market reforms in dynamic macro models.