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In macroeconomics, money supply (or money stock) refers to the total volume of money held by the public at a particular point in time. There are several ways to define "money", but standard measures usually include currency in circulation (i.e. physical cash) and demand deposits (depositors' easily accessed on the books of financial institutions).Alan Deardorff. "Money supply," Deardorff's Glossary of International EconomicsKarl Brunner, "money supply," ', v. 3, p. 527. Money supply data is recorded and published, usually by the national statistical agency or the central bank of the country. Empirical money supply measures are usually named M1 , M2 , M3''', etc., according to how wide a definition of money they embrace. The precise definitions vary from country to country, in part depending on national financial institutional traditions.
Even for narrow aggregates like M1, by far the largest part of the money supply consists of deposits in , whereas currency ( and ) issued by central banks only makes up a small part of the total money supply in modern economies. The public's demand for currency and bank deposits and commercial banks' supply of are consequently important determinants of money supply changes. As these decisions are influenced by central banks' monetary policy, not least their setting of , the money supply is ultimately determined by complex interactions between non-banks, commercial banks and central banks.
According to the quantity theory supported by the monetarist school of thought, there is a tight causal connection between growth in the money supply and inflation. In particular during the 1970s and 1980s this idea was influential, and several major central banks during that period attempted to control the money supply closely, following a monetary policy target of increasing the money supply stably. However, the strategy was generally found to be impractical because money demand turned out to be too unstable for the strategy to work as intended.
Consequently, the money supply has lost its central role in monetary policy, and central banks today generally do not try to control the money supply. Instead they focus on adjusting interest rates, in developed countries normally as part of a direct inflation target which leaves little room for a special emphasis on the money supply. Money supply measures may still play a role in monetary policy, however, as one of many economic indicators that central bankers monitor to judge likely future movements in central variables like employment and inflation.
This continuum corresponds to the way that different types of money are more or less controlled by monetary policy. Narrow measures include those more directly affected and controlled by monetary policy, whereas broad money are less closely related to monetary-policy actions.
The different types of money are typically classified as " M"s. The "M"s usually range from M0 (narrowest) to M3 (and M4 in some countries) (broadest), but which "M"s, if any, are actually focused on in central bank communications depends on the particular institution. A typical layout for each of the "M"s is as follows for the United States:
| Notes and coins in circulation (outside Federal Reserve Banks and the vaults of depository institutions) (currency) | ✓. DollarDaze Economic Commentary Blog by Mike Hewitt. | ✓ | ✓ | ✓ | ✓ | ✓ |
| Notes and coins in bank vaults (vault cash) | ✓ | |||||
| Federal Reserve Bank credit (required reserves and excess reserves not physically present in banks) | ✓ | |||||
| Traveler's checks of non-bank issuers | ✓ | ✓ | ✓ | ✓ | ||
| ✓ | ✓ | ✓ | ✓ | |||
| Other checkable deposits (OCDs), which consist primarily of negotiable order of withdrawal (NOW) accounts at depository institutions and credit union share draft accounts. | ✓ M1 Money Stock (M1) – FRED – St. Louis Fed. Research.stlouisfed.org. | ✓ | ✓ | ✓ | ||
| ✓ | ✓ | ✓ | ✓ | |||
| Time deposits less than $100,000 and retail money market funds, for individual investors | ✓ | ✓ | ||||
| Large time deposits, institutional money market funds, short-term repurchase and other larger liquid assets M3 Definition. Investopedia (February 15, 2009). | ✓ | |||||
| All money market funds | ✓ |
In the money supply statistics, central bank money is MB while the commercial bank money is divided up into the M1–M3 components, where it makes up the non- M0 component.
By far the largest part of the money used by individuals and firms to execute economic actions are commercial bank money, i.e. deposits issued by banks and other financial institutions. In the United Kingdom, deposit money outweighs the central bank issued currency by a factor of more than 30 to 1. In the United States, where the country's currency has a special international role being used in many transactions around the world, legally as well as illegally, the ratio is still more than 8 to 1. (2025). 9781349951215, Palgrave Macmillan UK. ISBN 9781349951215 Commercial banks create money whenever they make a loan and simultaneously create a matching deposit in the borrower's bank account. In return, money is destroyed when the borrower pays back the principal on the loan. Movements in the money supply therefore to a large extent depend on the decisions of commercial banks to supply loans and consequently deposits, and the public's behavior in demanding currency as well as bank deposits. These decisions are influenced by the monetary policy of central banks, so that money supply is ultimately created by complex interactions between banks, non-banks and central banks.
Even though central banks today rarely try to control the amount of money in circulation, their policies still impact the actions of both commercial banks and their customers. When setting the interest rate on central bank reserves, interest rates on bank loans are affected, which in turn affects their demand. Central banks may also affect the money supply more directly by engaging in various open market operations. They can increase the money supply by purchasing government securities, such as or . This increases the liquidity in the banking system by converting the illiquid securities of commercial banks into liquid deposits at the central bank. This also causes the price of such securities to rise due to the increased demand, and interest rates to fall. In contrast, when the central bank "tightens" the money supply, it sells securities on the open market, drawing liquid funds out of the banking system. The prices of such securities fall as supply is increased, and interest rates rise.
In some economics textbooks, the supply-demand equilibrium in the markets for money and reserves is represented by a simple so-called money multiplier relationship between the monetary base of the central bank and the resulting money supply including commercial bank deposits. This is a short-hand simplification which disregards several other factors determining commercial banks' reserve-to-deposit ratios and the public's money demand.
A bank can issue a Hong Kong dollar only if it has the equivalent exchange in US dollars on deposit. The currency board system ensures that Hong Kong's entire monetary base is backed with US dollars at the linked exchange rate. The resources for the backing are kept in Hong Kong's exchange fund, which is among the largest official reserves in the world. Hong Kong also has huge deposits of US dollars, with official foreign currency reserves of 331.3 billion USD .
There are several different definitions of money supply to reflect the differing stores of money. Owing to the nature of bank deposits, especially time-restricted savings account deposits, M4 represents the most Market liquidity measure of money. M0, by contrast, is the most liquid measure of the money supply.
Prior to 2020, savings accounts were counted as M2 and not part of M1 as they were not considered "transaction accounts" by the Fed. (There was a limit of six transactions per cycle that could be carried out in a savings account without incurring a penalty.) On March 15, 2020, the Federal Reserve eliminated reserve requirements for all depository institutions and rendered the regulatory distinction between reservable "transaction accounts" and nonreservable "savings deposits" unnecessary. On April 24, 2020, the Board removed this regulatory distinction by deleting the six-per-month transfer limit on savings deposits. From this point on, savings account deposits were included in M1.
Although the Treasury can and does hold cash and a special deposit account at the Fed (TGA account), these assets do not count in any of the aggregates. So in essence, money paid in taxes paid to the Federal Government (Treasury) is excluded from the money supply. To counter this, the government created the Treasury Tax and Loan (TT&L) program in which any receipts above a certain threshold are redeposited in private banks. The idea is that tax receipts won't decrease the amount of reserves in the banking system. The TT&L accounts, while demand deposits, do not count toward M1 or any other aggregate either.
When the Federal Reserve announced in 2005 that they would cease publishing M3 statistics in March 2006, they explained that M3 did not convey any additional information about economic activity compared to M2, and thus, "has not played a role in the monetary policy process for many years." Therefore, the costs to collect M3 data outweighed the benefits the data provided. Some politicians have spoken out against the Federal Reserve decision to cease publishing M3 statistics and have urged the U.S. Congress to take steps requiring the Federal Reserve to do so. Congressman Ron Paul (R-TX) claimed that "M3 is the best description of how quickly the Fed is creating new money and credit. Common sense tells us that a government central bank creating new money out of thin air depreciates the value of each dollar in circulation." What the Price of Gold Is Telling Us. Lewrockwell.com (April 25, 2006). Some of the data used to calculate M3 are still collected and published on a regular basis. Current alternate sources of M3 data are available from the private sector.
In the United States, a bank's reserves consist of U.S. currency held by the bank (also known as "vault cash"12 C.F.R. sec. 204.2(k).) plus the bank's balances in Federal Reserve accounts.12 C.F.R. sec. 204.5(a). What is vault cash? definition and meaning. Investorwords.com. For this purpose, cash on hand and balances in Federal Reserve ("Fed") accounts are interchangeable (both are obligations of the Fed). Reserves may come from any source, including the Federal funds, deposits by the public, and borrowing from the Fed itself..
As of April 2013, the monetary base was $3 trillion and M2, the broadest measure of money supply, was $10.5 trillion.
In light of the fact that modern central banks have generally ceased to target the money supply as an explicit policy variable, in some more recent macroeconomic textbooks the IS-LM model has been modified to incorporate the fact that rather than manipulating the money supply, central banks tend to conduct their policies by setting policy interest rates more directly.
In practice, macroeconomists almost always use real GDP to define , omitting the role of all other transactions. Either way, the equation in itself is an identity which is true by definition rather than describing economic behavior. That is, velocity is defined by the values of the other three variables. Unlike the other terms, the velocity of money has no independent measure and can only be estimated by dividing by . Adherents of the quantity theory of money assume that the velocity of money is stable and predictable, being determined mostly by financial institutions. If that assumption is valid, then changes in can be used to predict changes in . If not, then a model of is required in order for the equation of exchange to be useful as a macroeconomics model or as a predictor of prices.
Most macroeconomists replace the equation of exchange with equations for the demand for money which describe more regular economic behavior. However, predictability (or the lack thereof) of the velocity of money is equivalent to predictability (or the lack thereof) of the demand for money (since in equilibrium real money demand is simply ).
There is some empirical evidence of a direct relationship between the growth of the money supply and long-term price inflation, at least for rapid increases in the amount of money in the economy. The quantity theory was a cornerstone for the monetarists and in particular Milton Friedman, who together with Anna Schwartz in 1963 in a pioneering work documented the relationship between money and inflation in the United States during the period 1867–1960. During the 1970s and 1980s the monetarist ideas were increasingly influential, and major central banks like the Federal Reserve, the Bank of England and the German Bundesbank officially followed a monetary policy objective of increasing the money supply in a stable way.
Even though today central banks generally do not try to determine the money supply, monitoring money supply data may still play a role in the preparation of monetary policy as part of a wide array of financial and economic data that policymakers review. Developments in money supply may contain information of the behavior of commercial banks and of the general economic stance which is useful for judging future movements in, say, employment and inflation. Also in this respect, however, money supply data have a mixed record. In the United States, for instance, the Conference Board Leading Economic Index originally included a real money supply (M2) component as one of its 10 leading indicators, but removed it from the index in 2012 after having ascertained that it had performed poorly as a leading indicator since 1989.
(2025). 9781292360898, Pearson. ISBN 9781292360898
National definitions of "money"
East Asia
Hong Kong
The Hong Kong Basic Law and the Sino-British Joint Declaration provides that Hong Kong retains full autonomy with respect to currency issuance. Currency in Hong Kong is issued by the government and three local banks under the supervision of the territory's de facto central bank, the Hong Kong Monetary Authority. Bank notes are printed by Hong Kong Note Printing.
Currency peg history
Hong Kong's exchange rate regime has changed over time.
Japan
The Bank of Japan defines the monetary aggregates as:
Europe
Eurozone
The European Central Bank's definition of euro area monetary aggregates:
United Kingdom
There are just two official UK measures. M0 is referred to as the "wide monetary base" or "narrow money" and M4 is referred to as "broad money" or simply "the money supply".
(2025). 9780199563388, Oxford University Press. ISBN 9780199563388
North America
United States
The United States Federal Reserve published data on three monetary aggregates until 2006, when it ceased publication of M3 data and only published data on M1 and M2. M1 consists of money commonly used for payment, basically currency in circulation and checking account balances; and M2 includes M1 plus balances that generally are similar to transaction accounts and that, for the most part, can be converted fairly readily to M1 with little or no loss of principal. The M2 measure is thought to be held primarily by households. Prior to its discontinuation, M3 comprised M2 plus certain accounts that are held by entities other than individuals and are issued by banks and thrift institutions to augment M2-type balances in meeting credit demands, as well as balances in money market mutual funds held by institutional investors. The aggregates have had different roles in monetary policy as their reliability as guides has changed. The principal components are:
Oceania
Australia
The Reserve Bank of Australia defines the monetary aggregates as:
New Zealand
The Reserve Bank of New Zealand defines the monetary aggregates as: Series description – Monetary and financial statistics. Rbnz.govt.nz.
South Asia
India
The Reserve Bank of India defines the monetary aggregates as:
Importance of money supply
The importance which has historically been attached to the money supply in the monetary policy of central banks is due to the suggestion that movements in money may determine important economic variables like prices (and hence inflation), output and employment. Indeed, two prominent analytical frameworks in the 20th century both built on this premise: the Keynesian IS-LM model and the monetarist quantity theory of money.
IS-LM model
The IS-LM model was introduced by John Hicks in 1937 to describe Keynesian macroeconomic theory. Between the 1940s and mid-1970s, it was the leading framework of macroeconomic analysis and is still today an important conceptual introductory tool in many macroeconomics textbooks. In the traditional version of this model it is assumed that the central bank conducts monetary policy by increasing or decreasing the money supply, which affects interest rates and consequently investment, aggregate demand and output.
Quantity theory of money
According to the quantity theory of money, inflation is caused by movements in the supply of money and hence can be controlled by the central bank if the bank controls the money supply. The theory builds upon Irving Fisher's equation of exchange from 1911:The Purchasing Power of Money, its Determination and Relation to Credit, Interest and Crises, Irving Fisher.
where
Declining importance
Starting in the mid-1970s and increasingly over the next decades, the empirical correlation between fluctuations in the money supply and changes in income or prices broke down, and there appeared clear evidence that money demand (or, equivalently, velocity) was unstable, at least in the short and medium run, which is the time horizon that is relevant to monetary policy. This made a money target less useful for central banks and led to the decline of money supply as a tool of monetary policy. Instead central banks generally switched to steering interest rates directly, allowing money supply to fluctuate to accommodate fluctuations in money demand. Concurrently, most central banks in developed countries implemented direct inflation targeting as the foundation of their monetary policy, which leaves little room for a special emphasis on the money supply. In the United States, the strategy of targeting the money supply was tried under Federal Reserve chairman Paul Volcker from 1979, but was found to be impractical and later given up. According to Benjamin Friedman, the number of central banks that actively seek to influence money supply as an element of their monetary policy is shrinking to zero.
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