In a second step, the bank needs to get the base money necessary for the credit expansion (note that empirically, banks have to fulfil their reserve requirements only ex post so they expand credit before getting the reserves necessary to back them). For simplicity, we assume a minimum reserve requirement of 100 per cent on deposits, so the bank needs to get 100 pesos in central bank reserves. If the bank is solvent and has sound marketable securities, it can borrow these reserves from the central bank either via the discount window or via open market.
