Final answer:
The Federal Open Market Committee (FOMC), part of the Federal Reserve system, determines the quantity of money in the economy primarily through open market operations.
Explanation:
The Federal Open Market Committee (FOMC), which is part of the Federal Reserve system in the United States, determines the quantity of money in the economy as its most important task through open market operations. The FOMC consists of the seven members of the Federal Reserve Board and five of the 12 Federal Reserve Bank presidents.
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