.IF THERE IS one iron rule of financing, it is that any scheme which shows up to produce large, trustworthy earnings is actually concealing some likewise significant risks. History is packed with examples of such money-spinners becoming hugely prominent, merely for devotees to belatedly know that they may generate unexpected reductions along with constant gains. Should that require lots of folks to leave similar fields at the same time, the knock-on effects can easily intimidate all type of some others properties, or maybe the financial system itself. Think of the enormous bets on subprime mortgage loans that preceded the worldwide financial problems of 2007-09. The latest instance is actually the Eastern yen "bring exchange", the relaxing of which has actually been roiling markets since mid-July while swiftly increasing the value of the yen. What is actually a bring exchange, and exactly how can it unravel thus violently?