This is going to be great for the U.S economy:
http://useconomy.about.com/od/glossary/g/yen_carry_trade.htm
> Definition: The yen carry trade is when investors borrow yen at a low interest rate. They exchange it for U.S. dollars or any currency in a country that pays a high interest rate on its bonds. They receive a low-risk profit when they receive high interest on the money invested, but pay low interest on the money borrowed. The broker pays the difference into the account each day the trade is open
>The yen carry trade is alive and well in 2015, but not with the U.S. dollar. That ended in 2008 when the Federal Reserve dropped the Fed funds rate to near zero. It continued with high-yield currencies such as the Brazilian real, Australian dollar, and Turkish lira. For example, many forex traders borrow near-zero yen to buy Australian dollars which have a 4.5% return.
This is where all the money lent out is going to go, from the Japanese negative interest rate to the new slightly above zero U.S bond yield. Keeps the party going for a little while longer. Follow the money.