We analyze models of product differentiation with perfect price discrimination and free entry. Although perfect price discrimination ensures efficient output decisions given product characteristics, coordination failures may prevent efficiency in the choice of product characteristics. More...

Although the GATT prohibits discriminatory import tariffs, it includes means for circumventing this prohibition. The previous literature uses static models and discriminatory tariffs increase welfare. In a dynamic model, if governments lack the ability to precommit, this is not necessarily true....

In sender--receiver games high--quality types can distinguish themselves from low--quality types by sending a costly signal. Allowing for additional, noisy information on sender types can radically alter sender behavior in such games. We examine equilibria where medium types separate themselves...

Recent empirical work on the effects of minimum wages has called into question the conventional wisdom that minimum wages invariably reduce employment. We develop a model of \emph{monopsonistic competition} with \emph{free entry} to analyze the effects of minimum wages, and our predictions fit...

A number of theories (search and efficiency wages) have been developed, in part, to explain why identically able workers are often paid different wages. However, when there is a minimum wage, they do not explain the resulting ``spike" in the wage distribution. Our model's predictions are...

We consider a standard model of consumer switching costs with demand uncertainty where firms observe private information about demand. Given this private information, each firm forms beliefs over different demand realizations as well as beliefs over the other firm's information. The main result...

We study dynamic price adjustment under imperfect competition when consumers have non-time-separable preferences. In our model an intertemporal link arises in the consumers' maximization problems because current consumption decisions affect the utility of future consumption. Thus future demand...

I examine a Knightian model of entrepreneurial risk and investment where in addition to the self-selection process for choosing entrepreneurs, there is an evolutionary selection process over the representation of various risk attitudes. Under a standard evolutionary dynamic, rather than...