The M1 money multiplier decreases and the money supply decreases when the required reserve ratio on checkable deposits rises, all else being equal.
The percentage of deposits that commercial banks must retain in cash under the guidance of the central bank is known as the cash reserve ratio.
The required reserve ratio is directly correlated to how much a bank expands the money supply. For instance, if a bank has deposits totaling $1,000,000 and a reserve ratio of 10%, it can lend out $900,000.
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