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Trade Things Your Bosses Don't Understand

Both Jerome Kerveil and Kweku Adoboli were on "Delta One" desks, which trade complex over-the-counter derivatives that are supposed to perfectly mimic the performance of other financial instruments.

They were complex enough that few people inside their banks understood how they worked. This made it easier to ramp up risk without anyone knowing what was happening.

Photo: Tom Grill | Getty Images