At first glance, the history of the modern global economy seems to support the long-held view that the currency of the world’s leading power invariably dominates international trade and finance. But in How Global Currencies Work, three noted economists overturn this conventional wisdom. Offering a new history of global finance over the past two centuries and marshaling extensive new data to test current theories of how global currencies work, the authors show that several national monies can share international currency status―and that their importance can change rapidly. They demonstrate how changes in technology