.IF THERE is actually one iron regulation of money, it is actually that any sort of program which seems to produce large, dependable revenues is actually hiding some correspondingly large threats. History is loaded along with instances of such money-spinners coming to be hugely preferred, only for fans to belatedly understand that they can produce quick losses along with stable gains. Must that force bunches of individuals to desert identical fields at once, the knock-on effects can easily endanger all kind of additional resources, and even the monetary system itself. Think of the enormous bank on subprime mortgage loans that anticipated the international financial problems of 2007-09. The latest example is actually the Oriental yen "hold exchange", the unwinding of which has been roiling markets because mid-July while rapidly boosting the market value of the yen. What is a lug trade, and exactly how can it untangle therefore violently?