If you total the value of capital markets in the world it comes to $212 trillion. U.S. bonds make up 24% of the total value of all bonds and U.S. stocks constitute 45% of the total value of all stocks. If you want to raise capital, the biggest markets are denominated in dollars. This is the main reason that the dollar is the world’s reserve currency.
http://qvmgroup.com/invest/2012/04/02/world-capital-markets-size-of-global-stock-and-bond-markets/
