Almost nothing at all, individually the biggest banks and 'players' have almost no power. There is no conspiracy to crash a market and earn a pay out, a few people have tried this, not only is it illegal and they went to prison, but they also made losses. In an ideal world the market rises and rises, when falls occur there is a mutual fear, and most players lose money, big or small. traders in investment banks are almost invariably long, I'm sure most are hurting today.
1) failed attempt in silver: http://en.wikipedia.org/wiki/Silver_Thursday
2) http://en.wikipedia.org/wiki/Cornering_the_marke

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