American Economic Association A Search-Theoretic Approach to Monetary Economics Author(s): Nobuhiro Kiyotaki and Randall Wright Source: The American Economic Review, Vol. 83, No. 1 (Mar., 1993), pp. 63-77 Published by: American Economic Association Stable URL: http://www.jstor.org/stable/2117496 . Accessed: 14/09/2011 06:08 Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at . http://www.jstor.org/page/info/about/policies/terms.jsp JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact
[email protected]. American Economic Association is collaborating with JSTOR to digitize, preserve and extend access to The American Economic Review. http://www.jstor.org A Search-TheoreticApproach to MonetaryEconomics By NOBUHIRO KIYOTAKI AND RANDALL WRIGHT * The essentialfunction of money is its role as a medium of exchange. We formalizethis idea using a search-theoreticequilibrium model of the exchange process that capturesthe "doublecoincidence of wants problem"with pure barter. One advantage of the frameworkdescribed here is that it is very tractable.We also show that the modelcan be used to addresssome substantive issuesin monetaryeconomics, including the potentialwelfare-enhancing role of money,the interactionbetween specialization and monetaryexchange, and the possibilityof equilibriawith multiplefiat currencies.(JEL EOO,D83) Since the earliest writings of the classical theoretic equilibrium model of the exchange economists it has been understood that the process that seems to capture the "double essential function of money is its role as a coincidence of wants problem" with pure medium of exchange.