After a century and a half of efforts at constructing arrangements and rules for international monetary interaction, present-day national authorities do not seem to have come much closer to achieving the aim of enduring exchange rate stability combined with a good macroeconomic performance. A distinguished group of economists and economic historians offers new insights into the working of the most important of such experiences, including nineteenth century bimetallism, the 'classical' gold standard, Bretton Woods and the European Monetary System.