As the country becomes the largest international trading empire, its transactions can be paid with its currency, making it the preferred global medium of exchange. And because their currency is so widely accepted and frequently used, people around the world want to save in it, making it the preferred storehold of wealth and thus the world's leading reserve currency. The Gilder was the world's main reserve currency when the Dutch led world trade. The pound was when the British led and the dollar has been sin ...