The income velocity of money-an inverse measure of the demand for money balances-is the ratio of the money value of income to the average money stock that the public (excluding banks) holds in a given period. Why the magnitude of that ratio has changed over time is the subject of Michael D. Bordo and Lars Jonung's classic study, originally published as "The Long-Run Behavior of the Velocity of Circulation." Supported by statistical data, econometric estimation techniques, and meticulous historical analysis, this work describes, in an international setting, how slow-moving economic, social, and political forces interact with the decisions households and firms make about how much money to hold. Annual time series of velocity for several countries from the late nineteenth century to the late twentieth century display a U-shaped pattern. Existing theories can explain each section of the velocity curve-the falling, flat, and rising parts-but the overall pattern is not consistent with any one theory. Here the authors put forth a comprehensive explanation for this behavior over time. Their theory is largely an extension of the approach of Knut Wicksell, the Swedish economist who stressed the role of substitution between monetary assets. This approach, which emphasizes institutional variables, is incorporated into the arguments for the traditional long-run money demand (velocity) function. Four types of empirical evidence strongly support the authors' theory: econometric studies of the long-run velocity function for several countries; a cross section study of approximately eighty countries in the postwar period; a case study of the Swedish monetization process in the fifty years before World War I; and an examination of the time series properties of velocity. "Demand for Money" suggests that institutional factors, as opposed to real income, play a greater role in velocity than previously thought. And these institutional factors have a major impact on monetary policy. This is a book that will prove of great value to economists, monetary strategists, and policymakers. br> Michael D. Bordo is professor of economics and director of the Center for Monetary and Financial History at Rutgers University. He is editor of a series of books, "Studies in Macroeconomic History," and the author of "Essays on the Gold Standard and Related Regimes," and (with Anna J. Schwartz) "A Retrospective on the Classical Gold Standard 1821-1931." Lars Jonung is research adviser at ECFIN, European Commission, Brussels. He was previously professor of economics at the Stockholm School of Economics, and served as chief economic advisor to Prime Minister Carl Bildt from 1992 to 1994. Jonung is the author of "The Political Economy of Price Controls: The Swedish Experience 1970-1985," and editor of "The Stockholm School of Economics Revisited."