What is M3 Money Supply? Definition, Components, and Economic Role
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
M3 money supply is the broadest traditional measure of money. It adds large time deposits, institutional money market funds, repurchase agreements and similar holdings to M2.
Key takeaways
- The Fed stopped publishing M3 in 2006, saying it added no information beyond what M2 already provided.
- The former U.S. definition counted time deposits of $100,000 or more and Eurodollars held by U.S. residents.
- The Reserve Bank of India defines M3 at its core as M1 plus time deposits with banks.
- The ECB keeps M3 central to its monetary analysis and historically set a 4.5% annual growth reference value.
M3 money supply is the broadest of the traditional measures of money. It starts with M2 (cash, checking deposits, savings deposits, small time deposits and retail money market funds) and adds less liquid holdings that large institutions and corporations use to park money: large time deposits, institutional money market fund balances, short-term repurchase agreements and similar instruments. M3 treats money mainly as a store of value rather than as a means of payment, which is why it is called broad money. The U.S. Federal Reserve stopped publishing M3 in 2006, but the concept remains in use. The European Central Bank and the Reserve Bank of India publish their own M3 series.
How M3 fits among M0, M1, M2 and M4
Monetary aggregates nest inside one another, ordered from most to least liquid:
- M0 (base or narrow money): physical currency, and in many definitions bank reserves held at the central bank.
- M1: currency in circulation plus demand deposits such as checking accounts, traveler’s checks and other checkable deposits.
- M2: M1 plus savings deposits, small time deposits (CDs) and retail money market funds.
- M3: M2 plus large time deposits, institutional money market funds, repurchase agreements that mature in days or weeks, and (in the former U.S. definition) Eurodollar deposits held by U.S. residents.
Each step outward adds assets that are harder to spend immediately. You can write a check against M1 balances. A $500,000 time deposit or an overnight repo is money only in the sense that it converts to cash quickly and at a known value.
M4 is a United Kingdom measure. The Bank of England uses it as its headline broad money aggregate, covering cash and deposits held by the UK private sector (households and non-financial and financial companies) at banks and building societies.
The M3 formula
The U.S. version, as the Fed defined it before 2006:
M3 = M2 + large time deposits ($100,000 or more) + institutional money market fund balances + repurchase agreements + Eurodollars
The Reserve Bank of India uses a simpler structure:
M3 = M1 + time deposits with banks
India’s M3 also includes some smaller items, but this is the core. Both versions follow the same logic: start with transaction money and add balances that earn interest and sit for a while.
Example of M3 money supply
Take a hypothetical economy with these balances, in billions:
| Component | Amount |
|---|---|
| M2 | $10,000 |
| Large time deposits | $1,200 |
| Institutional money market funds | $900 |
| Repurchase agreements | $400 |
M3 = 10,000 + 1,200 + 900 + 400 = $12,500 billion.
Analysts usually watch growth rather than the level. If M3 had been $11,900 billion a year earlier, year-over-year growth would be (12,500 − 11,900) ÷ 11,900 ≈ 5.0%.
Why M3 matters in economic analysis
Economists used broad money to estimate how much purchasing power exists in an economy and to help guide inflation control. In the monetarist view, money growing faster than real output tends to push up prices over time. Comparing M3 growth with GDP growth and with readings such as the Consumer Price Index was one way to judge whether monetary conditions were loose or tight.
M3 is also useful because it shows how large institutions hold money. When corporations and funds shift cash between checking balances and repos or large deposits, M1 and M2 can move while M3 stays steady. The broad measure reveals that money changed form rather than appeared or disappeared.
The ECB still makes M3 central to its “monetary analysis” and historically set a reference value of 4.5% annual M3 growth.
Why the Fed discontinued M3
From the 1980s the Fed relied more on M2 than on M3. In 1993 Chairman Alan Greenspan said the Fed would no longer use money aggregates such as M2 as policy guides. When the Fed ended M3 publication in 2006, it said M3 did not convey information about economic activity beyond what M2 already provided and had not played a role in monetary policy for years. Collecting the extra data was not worth the cost.
Limitations of M3 money supply
- Equal weighting. A dollar in a checking account and a dollar in an overnight repo count the same, though they affect spending very differently. Measures that weight components by liquidity (such as Divisia indexes) try to fix this.
- Unstable link to inflation. Financial innovation changes where money sits, so the relationship between broad money growth and prices has shifted over time.
- No common definition. U.S., euro area and Indian M3 differ, so cross-country comparisons need care, especially when converting to one currency.
- Discontinued U.S. data. Post-2006 U.S. M3 figures come from reconstructions or alternative sources, such as the series the Federal Reserve Bank of St. Louis still carries, not from the Fed’s own release.
FAQs
Does M3 include all wealth?
No. M3 counts deposits and short-term money market instruments only. Stocks, bonds, real estate and other long-term assets are wealth but not money, so they are excluded. Movements in markets such as the S&P 500 change household wealth without changing M3 directly.
Is cryptocurrency part of M3?
No. Monetary aggregates count currency and claims on banks and money market funds denominated in the national currency. Cryptocurrencies are not issued by central banks or held as bank deposits, so they fall outside M0 through M3.
The Bottom Line
M3 matters most to economists and analysts tracking broad money in the euro area or India, where central banks still publish it. Its growth rate, compared with GDP and consumer prices, can signal loose or tight monetary conditions, though its link to inflation has shifted over time. U.S. M3 figures after 2006 come from reconstructions, and cross-country comparisons need care because definitions differ.
