Pricing derivatives and calculating risk realtime (i.e exposure) are really where the banks make their money. The big banks (Wall St) I've worked for had bette

Pricing derivatives and calculating risk realtime (i.e exposure) are really where the banks make their money. The big banks (Wall St) I've worked for had better systems that their competitors and therefore have a slight advantage of when to get in and out of positions. Of course, they still got screwed up with subprime.. :/