Rogue Trader

They don't follow the rules. They're outliers. They're dangerous.

Unsupervised, the trading community can literally bankrupt a major investment bank. A few traders who "went rogue" in the modern era cost their banks hundreds of millions of dollars in trading losses. The challenge revolves around the fact that so many complex derivatives trades have unknown liabilities and esoteric compositions, and there are only a few peers who can even understand the risk that the trader is actually taking. Hence, "rogue" is always gonna be a Thing.