At the zero lower bound, the New Keynesian model predicts that output and inflation collapse to implausibly low levels, and that government spending and forward guidance have implausibly large effects. To resolve these anomalies, we introduce wealth into the utility function; the justification...

This paper measures the unemployment gap (the difference between actual and efficient unemployment rates) using the Beveridge curve (the negative relationship between unemployment and job vacancies). We express the unemployment gap as a function of current unemployment and vacancy rates, and...

Most governments are mandated to maintain their economies at full employment. We propose that the best marker of full employment is the efficient unemployment rate, u*. We define u* as the unemployment rate that minimizes the nonproductive use of labor--both jobseeking and recruiting. The...

This paper describes the optimal level of government purchases in the presence of unemployment. The theoretical framework is a general-equilibrium matching model in which government purchases are valuable. When the unemployment gap is zero, the conventional Samuelson formula is valid. Otherwise,...

In recent decades, advanced economies have experienced low and stable inflation and long periods of liquidity trap. We construct an alternative business-cycle model capturing these two features by adding two assumptions to a money-in-the-utility-function model: the labor market is subject to...

This paper develops a model of unemployment fluctuations. The model keeps the architecture of the general-disequilibrium model of Barro and Grossman (1971) but takes a matching approach to the labor and product markets instead of a disequilibrium approach. On the product and labor markets, both...

We develop a theory of optimal unemployment insurance (UI) that accounts for workers' job-search behavior and firms' hiring behavior. The optimal replacement rate of UI is the conventional Baily [1978]-Chetty [2006a] rate, which solves the trade-off between insurance and job-search incentives,...

This paper argues that the social nature of humans, absent from the standard economic model, is crucial to understand our large modern social states and why concerns about inequality are so pervasive. A social solution arises when a situation is resolved at the group level (rather than the...

This paper proposes a new framework to study the distribution of taxes and the effects of tax reforms, connecting classical tax incidence analysis to optimal tax theory. To study the distribution of current taxes, labor taxes are assigned to the corresponding workers, capital taxes to the...

This paper provides evidence that asset testing of social transfers substantially depresses the liquid wealth of the poor. Our setting is Denmark where the low-income elderly receive an annual payment (around $3,000) if their end-of-year liquid wealth is below a threshold (around $15,000). Using...