Currency Trading Hits $4 Trillion a Day

Currency trading volume around the world has hit $4 trillion a day, fueled by investors in the wealthiest nations looking to diversify beyond their home markets in a time of economic turmoil.

The $4 trillion mark represents a 20% gain from $3.3 trillion in 2007, the last time the global foreign-exchange markets were surveyed, according to the Bank for International Settlements. While the survey found continued growth in currency trading, it did reflect a slowdown in the market's growth from the prior survey, when trading volumes had soared 69% from $1.9 trillion in 2004.

Read more in the Wall Street Journal.