Identify each statement as either true or false.
 - In the United States, banks keep the entire value of all customer deposits in the bank vault to meet customer withdrawals.
 - Banks typically loan out a portion of customer deposits.
 - Bank runs occur when many customers attempt to withdraw deposits from a bank at the same time and the bank is unable to pay all customer withdrawals.
 - The Federal Deposit Insurance Corporation (FDIC) protects bank depositors from bank failure.
 - The fractional reserve banking system requires all banks to keep the total value of customer deposits in their vaults to prevent bank runs.