Why does most interbank currency trading worldwide involve the U.S. dollar?
Answer: Trading in currencies worldwide is in opposition to a common currency which has international appeal. That type of currency has been the U.S. dollar as the end of World War II. Though, the deutsche mark and Japanese yen have started to be employed much more as international currencies in recent years. More significantly, trading would be exceedingly cumbersome and hard to manage if every trader made a market against all other currencies.