Full-reserve banking (also known as 100% reserve banking) is a proposed alternative to fractional reserve banking in which banks would be required to keep the full amount of each depositor's funds in cash, ready for immediate withdrawal on demand. Funds deposited by customers in demand deposit accounts (such as checking accounts) would not be loaned out by the bank because it would be legally required to retain the full deposit to satisfy potential demand for payments. Proposals for such systems generally do not place such restrictions on deposits that are not payable on demand, for example time deposits.
Monetary reforms that included full-reserve banking have been proposed in the past, notably in 1935 by a group of economists, including Irving Fisher, as a response to the Great Depression. Currently, no country in the world requires full-reserve banking: banks operating under a full-reserve ratio generally do so by choice or by contract.
Economist Milton Friedman at one time advocated a 100% reserve requirement for checking accounts, and economist Laurence Kotlikoff has also called for an end to fractional-reserve banking.Austrian School economist Murray Rothbard has written that reserves of less than 100% constitute fraud on the part of banks and should be illegal, and that full-reserve banking would eliminate the risk of bank runs.Jesús Huerta de Soto, another economist of the Austrian school, has also argued in favor of full-reserve banking; see his 2006 book Money, Bank Credit, and Economic Cycles.
Some economists have noted that under full-reserve banking, because banks would not earn revenue from lending against demand deposits, depositors would have to pay fees for the services associated with checking accounts. This, it is felt, would probably be rejected by the public although with central bank zero and negative interest rate policies, some writers have noted depositors are already experiencing paying to put their savings even in fractional reserve banks. Economists Douglas W. Diamond and Philip H. Dybvig have warned that under full-reserve banking, since banks would not be permitted to lend out funds deposited in demand accounts, this function could be expected to be taken over by unregulated institutions. Unregulated institutions (such as high-yield debt issuers) would take over the economically necessary role of financial intermediation and maturity transformation, therefore destabilizing the financial system and leading to more frequent financial crises.