What do we need to know about the international monetary system?

Paul Robin Krugman (/ˈkrʊɡmən/ ⓘ KRUUG-mən; born February 28, 1953) is an American economist who is the Distinguished Professor of Economics at the Graduate Center of the City University of New York and a columnist for The New York Times. In 2008, Krugman was the sole winner of the Nobel Memorial Prize in Economic Sciences for his contributions to new trade theory and new economic geography. The Prize Committee cited Krugman's work explaining the patterns of international trade and the geographic distribution of economic activity, by examining the effects of economies of scale and of consumer preferences for diverse goods and services. -English Wikipedia