Based on macroeconomic analysis, it is believed that by matching the items in the question with their effect, we have the Fed lends money to struggling banks. -- expanding the money supply;
The Fed regulates banks to ensure stability. -- expanding the money supply, or shrinking it;
The Fed buys mortgage-backed securities. -- expanding the money supply;
The Fed sells Treasury bonds to investors -- shrinking it;
Hence, in this case, it is concluded that there are various means by which the federal government can expand or shrink the money supply in the economy.
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