IN THE late 1990s your reviewer worked on the trading floor of a bank. It was understood there that if you walked out of a meeting with profitable gossip about, say, a takeover, one client should always get the first phone call: sac Capital, an American hedge fund, run by Steven Cohen. "Stevie" was, according to his legend, a day-trading idiot savant, a bully and a moneymaking genius who, when he wasn't staring at his screens, was trying to prove his sophistication by paying top dollar for trophy works of art, such as Damien Hirst's pickled shark (pictured). He paid so much in fees that the banks ate out of his hands.
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