The Economics of Money, Banking, and Financial Markets 10th Edition by Frederic Mishkin

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Unless otherwise noted, the following assumptions are made in all questions: The required reserve ratio on checkable deposits is 10%, banks do not hold any excess reserves, and the public's holdings of currency do not change.
Describe how each of the following can affect the money supply:
(a) the central bank;
(b) banks; and
(c) depositors.