Reserves are the cash in a bank's vault and deposits at Federal Reserve Banks. Under the fractional reserve banking system, a bank is obligated to hold a minimum amount of reserves to back up its deposits. Reserves held for that purpose, which are expressed as a percentage of a bank's demand deposits, are called required reserves. Therefore, the required reserve ratio is the percentage of a bank's deposits that are required to be held as reserves.
Banks create deposits when they make loans; the new deposits created are new money.
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