The document discusses the history and evolution of international monetary systems from 1816 to present. It describes the gold standard system from 1816-1914, the Bretton Woods system from 1945-1971, and modern exchange rate regimes. The gold standard linked currencies to gold, while the Bretton Woods system established a US dollar-backed system. Countries now choose between fixed exchange rates, where a currency is pegged to another, or floating rates, where the market determines a currency's value.