.IF THERE is actually one iron rule of finance, it is actually that any kind of program which shows up to generate huge, dependable revenues is hiding some similarly large threats. Record is packed with instances of such money-spinners coming to be significantly preferred, just for fans to belatedly become aware that they may create quick reductions along with consistent increases. Should that oblige bunches of people to desert comparable professions simultaneously, the ripple effects can easily endanger all type of other properties, or maybe the financial device itself. Think of the huge bets on subprime home mortgages that anticipated the global financial situation of 2007-09. The current example is the Japanese yen "bring trade", the unwinding of which has been roiling markets considering that mid-July while rapidly improving the market value of the yen. What is actually a lug exchange, as well as how can it solve therefore violently?