During the financial crisis, the Federal Reserve poured $1 trillion into the financial system to keep the economy from plunging. Brian Sack, an economist at the Federal Reserve Bank of New York, is in charge of figuring out how to soak up that money. Mr. Sack runs the Fed's market group, which manages the central bank's trading, buying and selling of Treasuries to influence interest rates. The group came up with complex programs during the past year, including purchases of mortgage-backed securities and commercial paper loans, and it must end the programs without disrupting the economy too much.
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