• $13 billion earned by banks via roundabout loans source

» How they worked: These banks took advantage of a set of emergency loans from the Federal Reserve distributed between August 2007 and April 2010. Bloomberg Markets magazine did the math on the numbers and figured out that, by looking at the companies’ net interest margin, you could see how the companies took advantage of the below-market rates they got on the loans to earn a profit. The companies that scored the biggest paydays? Citigroup, which earned $1.8 billion, and Bank of America, which earned $1.5 billion.

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