M1

The M1 is a measure of the money supply that includes the most liquid forms of money: physical currency in circulation plus demand deposits (checking account balances) at banks. M1 is the most narrow and most liquid definition of money—what you can spend immediately to buy goods or services.

The two components

M1 = Currency in circulation + Demand deposits

Currency in circulation: Physical money—bills and coins—held by the public.

Demand deposits: Checking account balances. These are not physical cash, but they are spendable immediately via check, debit card, or wire transfer. A $1,000 checking balance is, for practical purposes, as good as $1,000 in cash.

The sum of these two forms is M1.

Why M1 matters

M1 is the money supply measure most directly tied to near-term spending and inflation. If M1 grows rapidly, households and businesses have more cash and checking balances, so they are likely to spend more. If M1 shrinks, spending typically contracts.

Central banks watch M1 closely as an early indicator of inflation or deflation. A rapid M1 expansion often precedes an inflation pickup months later (the lag in the transmission mechanism). A shrinking M1 signals weakness ahead.

M1’s growth and the pandemic

During the COVID-19 pandemic, M1 exploded. Fiscal stimulus (government checks) and central bank asset purchases (quantitative easing) simultaneously expanded checking account balances and cash. M1 roughly doubled in 2020–2021.

This led to fierce debate. Some economists warned that the M1 surge would ignite severe inflation. Others argued that most of the M1 growth was temporary (reflecting one-time stimulus and unusual saving patterns) and that inflation would remain tame. Reality split the difference: inflation surged in 2021–2022, but the surge was less severe than the M1 growth alone would have suggested. The money multiplier fell (velocity of money declined), dampening the inflationary effect.

M1 and the velocity of money

The relationship between M1 and inflation depends partly on velocity—how often money is spent per unit time. If M1 is $4 trillion and annual spending is $8 trillion, the velocity is 2 (each dollar is spent twice per year on average).

The equation of exchange is: M × V = P × Q, where M is M1, V is velocity, P is the price level (inflation), and Q is real output. If M grows but V falls (people hold money longer before spending), inflation may not accelerate. This is what happened during COVID—huge M1 growth but collapsing velocity kept inflation muted initially.

See also