RRR = required reserve ratio. It is the portion of bank reserves (%of deposits) that cannot be lent to customers and must be kept as required reserves at the Central Bank. Required reserves = Deposits*RRR Excess reserves are the funds that banks hold beyond the required minimum set by the central bank. They represent extra liquidity that banks can lend or invest ER = Bank reserves - required reserves Money Multiplier is the maximum potential increase in the money supply when banks fully lend out their excess reserves. MM = ER / RRR A customer withdraws 15,000€, what are the bank’s options to avoid defaulting? Sell bonds, sell loans (may be illiquid), borrow from the market, borrow from the CB