What Are Monetary Aggregates?

Monetary aggregates are the layered measures of a country’s money supply — M0 up through M1, M2, M3 and M4. Each rung adds a wider band of liquidity to the one below it. No two countries stop at the same rung: the United States headlines M2, the euro area M3 (€17.61T, 2026-06), the United Kingdom M4 ($5.24T, 2024).

The M0-M4 monetary aggregates ladder

Five aggregates stack from narrowest to broadest on the liquidity ladder, each one adding a layer the one below it doesn’t count.

The US column above is the Federal Reserve’s own published reading, and it is not the figure we carry for the United States. Our US row is the IMF’s harmonised broad money, $30.68T (2025-12), which covers more instruments than the Fed’s M2 and runs about $7.5T above it. We keep the two apart everywhere on this site, and broad money sets out why.

The United States is the outlier at the narrow end: it still headlines M2, and dropped M3 in 2006 rather than adding a fourth rung. The euro area and Japan both stopped one rung further out, at M3. The UK alone built a fourth rung, M4, to capture building-society deposits its earlier M3 didn’t. Canada took a different branch entirely — M2++, a parallel ladder rather than a taller one. Each country’s own definition is covered on its own page: M1, M2, M3, M4.

Why monetary aggregate labels aren’t comparable across countries

“M2” names a different basket in every country that publishes one. China and the United States both headline M2, and the two baskets share a label and not much else in composition. China’s banking system routes more household savings through bank deposits than the US does, where more sits in equities and bonds outside any aggregate. Our own readings for the pair are $42.64T for China (2024, World Bank annual FM.LBL.BMNY.CN) and $30.68T for the United States (2025-12, IMF MFS_MA/BM_MAI, quarterly). Neither is that country’s own published M2. Both are the IMF-World Bank harmonised measure, which is the only way to set them side by side at all. Reading two “M2” figures side by side without checking what each one bundles is the single most common error in cross-country money-supply comparisons. It’s the error behind most “who’s printing more” arguments online. The euro area’s M3 (€17.61T, $19.90T converted, 2026-06) and the UK’s M4 ($5.24T, 2024) aren’t “bigger” or “smaller” aggregates in some universal sense, either. They’re differently-bundled totals for economies of very different sizes. We cover the full country-by-country reconciliation, letter by letter, at broad money.

Which monetary aggregate our dataset actually tracks

We don’t track “M2” or “M3” as fixed labels. We track the IMF’s harmonised broad-money series instead (MFS_MA/BM_MAI), built country by country to whatever that country’s own broadest published aggregate contains. The World Bank mirrors it as FM.LBL.BMNY.CN where the IMF table doesn’t carry a country at the frequency we need. By the Federal Reserve definition, that series is M2 for the United States. For the euro area, it’s ECB BSI M3 directly — our deepest single series, 558 monthly observations back to 1980-01. For the United Kingdom, it’s the World Bank’s annual mirror of Bank of England M4. One harmonised definition, not five separate national ones, is what lets us rank economies against each other. 161 of our 185 entities carry a USD conversion; 160 appear in the level rankings, because Somalia’s conversion is unreliable and we hold it out. The full sourcing, series by series, is documented at methodology.

A wider monetary aggregate isn’t a “better” number

A country with a taller ladder — the UK’s M4 over the US’s M2 — isn’t managing its money more thoroughly. A bigger level isn’t a bigger inflation risk on its own, either. Level and growth rate are different measurements entirely. South Sudan carries a fraction of the United States’ level. It still doubles its broad money every 1.3 years at its 10-year average growth rate of 69.6%, against 10.9 years for the United States at its own 10-year average of 6.6%. Both doubling times are read off the same metric. Neither is a forecast. The monetary aggregates a country happens to headline — M2, M3 or M4 — say nothing about how fast that money is growing, or why. Near money, the deposit layers M1 doesn’t count and M2 does, is exactly where that growth tends to concentrate first. Every ranking on this site keeps growth and level as separate questions for that reason. Every term used to get here is defined once at our glossary.

FAQ