Tobin's Q exceeds one, even without any adjustment costs, for a firm that earns rents as a result of monopoly power or of decreasing returns to scale in production. Even when there are no adjustment costs and marginal Q is always equal to one, Tobin's Q is informative about the firm's growth...

I analyze the implications of moral hazard in dynamic economy with production. In particular, I add agency frictions to a benchmark stochastic growth model, by assuming that firms observe output but hours worked and productivity are unobservable. I cast the problem as a continuous time principal...

Through marriage, individuals can share some risks that would otherwise be uninsurable. In this paper, we ask how much idiosyncratic income risk can be diversified away through marriage contracts alone versus how much risk there remains for public unemployment insurance programs to alleviate. We...

We study a multiperiod principal-agent problem with moral hazard in which the agent is required to exert effort only in the initial period of the contract. The effort choice of the agent in this first period determines the conditional distribution of output in the following periods. The paper...

This paper investigates the welfare and output effects of inflation in a monetary economy with search frictions and sticky prices. Agents trade in both a centralized Walrasian market and a decentralized search market. Trade has two dimensions: the frequency of trades (how often agents trade) and...

Models where money arises due to a transactions motive imply that an increase in aggregate activity will raise the demand for money. Models where money arises due to money being the most preferred form of precautionary savings imply that a decrease in individual uncertainty will lower the demand...

This paper studies optimal taxation of entrepreneurial capital and financial assets in economies with private information. Returns to entrepreneurial capital are risky and depend on entrepreneurs' effort, which is not observed. The presence of idiosyncratic risk in capital returns implies that...

Empirical evidence suggests that capital separation is an important phenomenon over and beyond depreciation and that reallocation is a costly and time-consuming process. In addition, both separation and reallocation rates display substantial variation over the business cycle. We build a dynamic...