There are two facts about the world that we take as given: First the "law of one price" is false -- one can find many different prices for what appears to be, beyond reasonable doubt, the same good. Second, prices are set in nominal terms and appear, beyond reasonable doubt, to be sticky -- some...

At any given point of time in an actual economy, some individuals hold more money than other individuals do. This non-degenerate distribution of money holdings among individuals is a rationale for a range of policies designed for reallocating liquidity among individuals. However, monetary theory...

In this paper, we develop a tractable model of the labor market featuring on-the-job search and aggregate fluctuations.

We document five facts about price dispersion.

We propose a novel theory of equilibrium price dispersion in product markets with search frictions. As in Diamond (1971), buyers search for sellers sequentially. In contrast to Diamond (1971), buyers do not meet all sellers with the same probability. Specifically, a fraction of the...

Arguably the most difficult question in macroeconomics is: why do individuals set prices in nominal terms that do not respond to changes in the aggregate price level? Of course some must respond, or the aggregate does not change, but many prices seem sticky in the short run. In popular macro...

We study the long run (low frequency) dynamic relationship between money, as measured by inflation or interest rates, and unemployment. We first discuss the data. We then develop a framework where money and unemployment are both modeled with microfoundations based on explicit frictions. This...

In this paper, we develop a general stochastic model of directed search on the job. Like in the analogous models of random search on the job, the state of the economy in our model includes the infinite-dimensional distribution of workers across different employment states (unemployment, and...

In this paper, we construct a tractable search model of money with a non-degenerate distribution of money holdings. We model search as a directed process in the sense that buyers know the terms of trade before visiting particular sellers, as opposed to undirected search that has dominated the...