reserve requirement
Reserve Ratios
reserve requirement
Reserve requirement.
The Federal Reserve requires its member banks to keep a certain percentage of their customer deposits in cash and other liquid assets in reserve at all times.
The required percentage may be revised at the Fed's discretion, but it has not been changed in recent years.
When a bank finds itself with excess reserves, it can lend them to other banks that may need them. These very short-term loans are known as federal funds and the interest rate the lenders charge is called the federal funds rate. That's also the benchmark rate for many corporate and international government loans.