How important is monopolistic competition to an understanding of the effects of aggregate demand on output? The authors ask this question at three levels. Can monopolistic competition, by itself, explain why aggregate demand affects output? Can it, together with other imperfections, generate...

The essential function of money is its role as a medium of exchange. The authors formalize this idea using a search-theoretic equilibrium model of the exchange process that captures the "double coincidence of wants problem" with pure barter. One advantage of the framework described here is that...

We develop a simple macroeconomic model of credit market imperfections with heterogeneous investment projects. The projects differ in productivity, the investment requirement, and the severity of agency problems behind the borrowing constraints. A movement in borrower net worth shifts the...

The credibility of temporary protection is examined in a simple infinite horizon, perfect information game of timing in which the domestic government uses the threat of future liberalization to induce the domestic firm to invest. All pure strategy subgame-perfect equilibria are cyclical and,...