When the central bank increases reserve requirements for banks, it forces banks to set aside more money, reducing the money supply and potentially having a contractionary effect on the economy.
When a country's central bank increases reserve requirements for banks, banks are forced to set aside more of their money instead of lending it out. This decrease in the amount of money available for lending can lead to a reduction in the money supply within the economy. As a result, this policy move can have a contractionary effect on the economy by limiting the amount of credit available to borrowers.
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