First, it is a mechanism that can be swiftly and inexpensively implemented—the Fed only needs to call a broker who buys or sells bonds.
Second, it doesn't require a lot of political discussions or a big announcement to be made.
Thirdly, it is a fairly potent instrument, with each bond purchase or sale having an overall effect that is several times greater than the original transaction.
Fourth, by using this mechanism, the Fed can alter the money supply by a small or big amount at any one time.
The Fed can do the following to reduce the growth of money in the US:
Sell bonds, increase reserve requirements, or increase the discount rate, among other options.
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