Fractional-reserve banking is the system of banking operating in almost all countries worldwide, under which banks that take deposits from the public are required to hold a proportion of their deposit liabilities in liquid assets as a reserve, and are at liberty to lend the remainder to borrowers. Bank reserves are held as cash in the bank or as balances in the bank’s account at the central bank. The country’s central bank determines the minimum amount that banks must hold in liquid assets, called the “reserve requirement” or “reserve ratio”. Most commercial banks hold more than this minimum amount as excess reserves.
Bank deposits are usually of a relatively short-term duration, and may be “at call”, while loans made by banks tend to be longer-term, resulting in a risk that customers may at any time collectively wish to withdraw cash out of their accounts in excess of the bank reserves. The reserves only provide liquidity to cover withdrawals within the normal pattern. Banks and the central bank expect that in normal circumstances only a proportion of deposits will be withdrawn at the same time, and that reserves will be sufficient to meet the demand for cash. However, banks may find themselves in a shortfall situation when depositors wish to withdraw more funds than the reserves held by the bank. In that event, the bank experiencing the liquidity shortfall may borrow short-term funds in the interbank lending market from banks with a surplus. In exceptional situations, such as during an unexpected bank run, the central bank may provide funds to cover the short-term shortfall as lender of last resort.
Because banks hold in reserve less than the amount of their deposit liabilities, and because the deposit liabilities are considered money in their own right (see commercial bank money), fractional-reserve banking permits the money supply to grow beyond the amount of the underlying base money originally created by the central bank. In most countries, the central bank (or other monetary policy authority) regulates bank-credit creation, imposing reserve requirements and capital adequacy ratios. This helps ensure that banks remain solvent and have enough funds to meet demand for withdrawals, and can be used to influence the process of money creation in the banking system. However, rather than directly controlling the money supply, central banks usually pursue an interest-rate target to control bank issuance of credit and the rate of inflation
Fractional-reserve banking predates the existence of governmental monetary authorities and originated with bankers’ realization that generally not all depositors demand payment at the same time. In the past, savers looking to keep their coins and valuables in safekeeping depositories deposited gold and silver at goldsmiths, receiving in exchange a note for their deposit (see Bank of Amsterdam). These notes gained acceptance as a medium of exchange for commercial transactions and thus became an early form of circulating paper money. As the notes were used directly in trade, the goldsmiths observed that people would not usually redeem all their notes at the same time, and they saw the opportunity to invest their coin reserves in interest-bearing loans and bills. This generated income for the goldsmiths but left them with more notes on issue than reserves with which to pay them. A process was started that altered the role of the goldsmiths from passive guardians of bullion, charging fees for safe storage, to interest-paying and interest-earning banks. Thus fractional-reserve banking was born.
If creditors (note holders of gold originally deposited) lost faith in the ability of a bank to pay their notes, however, many would try to redeem their notes at the same time. If, in response, a bank could not raise enough funds by calling in loans or selling bills, the bank would either go into insolvency or default on its notes. Such a situation is called a bank run and caused the demise of many early banks.
These early financial crises led to the creation of central banks. The Swedish Riksbank was the world’s first central bank, created in 1668. Many nations followed suit in the late 1600s to establish central banks which were given the legal power to set the reserve requirement, and to specify the form in which such assets (called the monetary base) are required to be held. In order to mitigate the impact of bank failures and financial crises, central banks were also granted the authority to centralize banks’ storage of precious metal reserves, thereby facilitating transfer of gold in the event of bank runs, to regulate commercial banks, to impose reserve requirements, and to act as lender-of-last-resort if any bank faced a bank run. The emergence of central banks reduced the risk of bank runs which is inherent in fractional-reserve banking, and it allowed the practice to continue as it does today.
During the twentieth century, the role of the central bank grew to include influencing or managing various macroeconomic policy variables, including measures of inflation, unemployment, and the international balance of payments. In the course of enacting such policy, central banks have from time to time attempted to manage interest rates, reserve requirements, and various measures of the money supply and monetary base.
Regulatory framework
In most legal systems, a bank deposit is not a bailment. In other words, the funds deposited are no longer the property of the customer. The funds become the property of the bank, and the customer in turn receives an asset called a deposit account (a checking or savings account). That deposit account is a liability on the balance sheet of the bank.
Each bank is legally authorized to issue credit up to a specified multiple of its reserves, so reserves available to satisfy payment of deposit liabilities are less than the total amount which the bank is obligated to pay in satisfaction of demand deposits. Largely, fractional-reserve banking functions smoothly, as relatively few depositors demand payment at any given time, and banks maintain enough of a buffer of reserves to cover depositors’ cash withdrawals and other demands for funds. However, during a bank run or a generalized financial crisis, demands for withdrawal can exceed the bank’s funding buffer, and the bank will be forced to raise additional reserves to avoid defaulting on its obligations. A bank can raise funds from additional borrowings (e.g., by borrowing in the interbank lending market or from the central bank), by selling assets, or by calling in short-term loans. If creditors are afraid that the bank is running out of reserves or is insolvent, they have an incentive to redeem their deposits as soon as possible before other depositors access the remaining reserves. Thus the fear of a bank run can actually precipitate the crisis.
Many of the practices of contemporary bank regulation and central banking—including centralized clearing of payments, central bank lending to member banks, regulatory auditing, and government-administered deposit insurance—are designed to prevent the occurrence of such bank runs.
Economic function
Fractional-reserve banking allows banks to provide credit, which represent immediate liquidity to borrowers. The banks also provide longer-term loans, and act as financial intermediaries for those funds. Less liquid forms of deposit (such as time deposits) or riskier classes of financial assets (such as equities or long-term bonds) may lock up a depositor’s wealth for a period of time, making it unavailable for use on demand. This “borrowing short, lending long” or maturity transformation function of fractional-reserve banking is a role that, according to many economists, can be considered to be an important function of the commercial banking system.
The process of fractional-reserve banking expands the money supply of the economy but also increases the risk that a bank cannot meet its depositor withdrawals. Modern central banking allows banks to practice fractional-reserve banking with inter-bank business transactions with a reduced risk of bankruptcy.
Additionally, according to macroeconomic theory, a well-regulated fractional-reserve bank system also benefits the economy by providing regulators with powerful tools for influencing the money supply and interest rates. Many economists believe that these should be adjusted by the government to promote macroeconomic stability
Money creation process
When a loan is made by the commercial bank, the bank creates new demand deposits and the money supply expands by the size of the loan.
The proceeds of most bank loans are not in the form of currency. Banks typically make loans by accepting promissory notes in exchange for credits they make to the borrowers’ deposit accounts. Deposits created in this way are sometimes called derivative deposits and are part of the process of creation of money by commercial banks. Issuing loan proceeds in the form of paper currency and current coins is considered to be a weakness in internal control.
The money creation process is also affected by the currency drain ratio (the propensity of the public to hold banknotes rather than deposit them with a commercial bank), and the safety reserve ratio (excess reserves beyond the legal requirement that commercial banks voluntarily hold). Data for “excess” reserves and vault cash are published regularly by the Federal Reserve in the United States.
Just as taking out a new loan expands the money supply, the repayment of bank loans reduces the money supply.
Types of money
There are two types of money created in a fractional-reserve banking system operating with a central bank:
- Central bank money: money created or adopted by the central bank regardless of its form – precious metals, commodity certificates, banknotes, coins, electronic money loaned to commercial banks, or anything else the central bank chooses as its form of money.
- Commercial bank money: demand deposits in the commercial banking system; also referred to as “chequebook money”, “sight deposits” or simply “credit”.
Money multiplier
The money multiplier is a heuristic used to demonstrate the maximum amount of broad money that could be created by commercial banks for a given fixed amount of base money and reserve ratio. This theoretical maximum is never reached, because some eligible reserves are held as cash outside of banks. Rather than holding the quantity of base money fixed, central banks have recently pursued an interest rate target to control bank issuance of credit indirectly so the ceiling implied by the money multiplier does not impose a limit on money creation in practice.
