This book describes and evaluates the literature on exchange rate economics. It provides a wide-ranging survey of the different theories that attempt to explain the behavior of exchange rates, and outlines the salient institutional characteristics of the modern foreign exchange market in the context of an evolving international monetary system. An important feature of the book is its emphasis throughout on the main policy issues relating to the stabilization of exchange rates. The level of exposition is relatively nontechnical, and will be intelligible to undergraduate students.