The answer appears to be, “psychopaths are much better for the rest of us“:

What makes individual stockbrokers blow billions in financial markets with criminal trading schemes? According to a new study conducted at a Swiss university, it may be because share traders behave more recklessly and are more manipulative than psychopaths.

Two weeks ago, yet another case of rogue trading shocked the financial world when UBS trader Kweku Adoboli was arrested for allegedly squandering some $2.3 billion with a risky and unauthorized investment scheme. The 31-year-old, who had been based in London for the Swiss bank, remains in jail. The bank’s chief executive Oswald Grübel, meanwhile, has resigned over the scandal — the third major embarrassment to rattle the institution in just a few years.

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According to a new study at the University of St. Gallen seen by SPIEGEL, one contributing factor may be that stockbrokers’ behavior is more reckless and manipulative than that of psychopaths. Researchers at the Swiss research university measured the readiness to cooperate and the egotism of 28 professional traders who took part in computer simulations and intelligence tests. The results, compared with the behavior of psychopaths, exceeded the expectations of the study’s co-authors, forensic expert Pascal Scherrer, and Thomas Noll, a lead administrator at the Pöschwies prison north of Zürich.

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“Naturally one can’t characterize the traders as deranged,” Noll told SPIEGEL. “But for example, they behaved more egotistically and were more willing to take risks than a group of psychopaths who took the same test.”

So, Dr. Noll, could you explain to me why we cannot, “characterize traders as deranged?”

It seems to me that if there is any lesson of the past few years, it is that traders are deranged.