si ça c'est pas un truc d'escroc :
http://www.nytimes.com/2009/07/24/bu...24trading.html
High-frequency traders often confound other investors by issuing and then canceling orders almost simultaneously. Loopholes in market rules give high-speed investors an early glance at how others are trading. And their computers can essentially bully slower investors into giving up profits — and then disappear before anyone even knows they were there.
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