When Harry Markopolos was in business school, one of his professors gave him an A. But Markopolos double-checked the formula the professor used to calculate grades and realized that there had been a mistake. He had actually earned an A-minus. He went to the professor and complained. In his first job out of business school, he worked for a brokerage selling over-the-counter stocks, and one of the rules of that marketplace is that the broker must report any trade within ninety seconds. Markopolos discovered that his new employer was waiting longer than ninety seconds. He reported his own bosses
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