contracontrarian

Five Reasons the Market Could Crash This Fall

"If Wall Street did put $50 trillion at risk… and 10% of that money goes bad (quite a low estimate given defaults on regulated securities) that means $5 trillion in losses: an amount equal to HALF of the total US stock market."

Any one particular Wall Street firm can lose everything they have or even more,but other Wall Street firms would earn the same amount at the same time,as they are on both sides of those derivative positions. Alltogether "Wall Street" can not lose money on their derivatives...