The document discusses the history and evolution of international monetary systems. It describes the gold standard system before WWI, the gold exchange standard in the 1920s-1930s, and the Bretton Woods system established in 1944 which pegged currencies to the US dollar backed by gold. The Bretton Woods system collapsed in the early 1970s leading to fluctuating exchange rates. More recently, there has been a movement towards more flexible exchange rate regimes and the establishment of the eurozone in Europe.