This paper investigates the welfare effects of inflation in economies with search frictions and menu costs. We first analyze an economy where there is no transaction demand for money balances: Money is a mere unit of account. We determine a condition under which price stability is optimal and a...

Monetary search models are valuable for studying how a second currency's acceptability arises endogenously in an economy that lacks a stable domestic currency and other more sophisticated payment systems. Search models' basic assumptions (absence of credit, lack of smoothly functioning banking...

We construct a model in which capital competes with fiat money as a medium of exchange, and establish conditions on fundamentals under which fiat money can be both valued and socially beneficial. When the socially efficient stock of capital is too low to provide the liquidity agents need, they...

Given estimates of shipping costs and scale economies for high-speed currency sorting, the authors investigate whether the Federal Reserve might lower its costs by reallocating the volume of sorting among its processing sites.

Recent legislation has removed U.S. legal impediments to issuing private bank notes. At the same time, improved transaction technologies have enabled banks and other entities to issue various forms of "e-cash." Consequently, developed economies may soon see the reemergence of privately issued...

I study random-matching economies where at money coexists with real assets, and no restrictions are imposed on payment arrangements. I emphasize informational asymmetries about asset fundamentals to explain the partial illiquidity of real assets and the usefulness of at money. The liquidity of...

The authors analyze a dual-currency search model in which agents may hold multiple units of both currencies. They study equilibria in which the two currencies are identical and equilibria in which the two currencies differ according to the magnitude of the "inflation tax" risk associated with...

We study general equilibrium with nonconvexities. In these economies there exist sunspot equilibria without the usual assumptions needed in convex economies, and they have good welfare properties. Moreover, in these equilibria, agents act as if they have quasi-linear utility. Hence wealth...

We study models that combine search, monetary exchange, price posting by sellers, and buyers with preferences that differ across random meetings - say, because sellers in different meetings produce different varieties of the same good. We show how these features interact to influence the price...