.IF THERE IS one iron rule of money, it is that any sort of system which shows up to create large, dependable incomes is concealing some likewise big threats. Background is actually loaded with examples of such money-spinners coming to be hugely preferred, just for fans to belatedly understand that they can easily generate unexpected reductions in addition to consistent increases. Should that force considerable amounts of individuals to abandon similar fields instantly, the knock-on effects can endanger all sorts of additional possessions, or even the financial device itself. Think of the substantial bets on subprime mortgages that preceded the worldwide economic crisis of 2007-09. The most up to date instance is the Eastern yen "bring trade", the unwinding of which has been roiling markets given that mid-July while quickly raising the worth of the yen. What is a bring trade, and also just how can it untangle so violently?