If college athletes asked him for advice in pursuing a career on the trading floor, he said, his message would be a simple one. Don’t. Two years ago, after nearly a decade working as an equity salesman, Mr. Savini left for 303 Capital Markets, a boutique investment-banking firm. “The business is changing,” he said. “It’s all going electronic.” “These guys are on the wrong side of Moore’s Law,” said Rett Wallace, a former investment banker, referring to the axiom on the exponential growth of computing power. “When Airbnb can handle two million unique properties at once, and Uber can manage more than a million drivers around the world in real time, are we really saying that a few hundred thousand bond issues can’t be traded by computer?”

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