US Money Supply AI Report

Understanding the US Money Supply: From Basics to Recent Shifts The money supply is a fundamental concept in economics, representing the total amount of money available in an economy at a given time. It's not just about physical cash; it includes various forms of liquid assets that can be used for transactions or savings. The Federal Reserve (Fed), the central bank of the United States, tracks and reports these measures to gauge economic health, influence monetary policy, and combat issues like inflation or recession. Why does it matter? Changes in the money supply can affect interest rates, spending, investment, and overall growth. For instance, a rapid increase might fuel inflation, while a contraction could signal tightening credit conditions.

In the US, the money supply is categorized into different aggregates, each broader than the last. The key ones are the monetary base (sometimes called M0 or MB), M1, and M2. (A broader M3 measure was discontinued by the Fed in 2006 due to its limited additional insight.) Below, we'll break them down, including their components and roles, before examining notable changes since 2021.

The Monetary Base (MB): The Foundation of Money
The monetary base, often referred to as M0 in some contexts but officially tracked as the "monetary base" by the Fed, is the narrowest measure. It represents the raw building blocks of the money supply controlled directly by the central bank. It consists of:

• Currency in circulation (physical notes and coins held by the public and banks).
• Reserve balances (deposits held by banks at the Federal Reserve, including required and excess reserves).

This measure is crucial because it's what the Fed manipulates through tools like open market operations, quantitative easing (QE), or reserve requirements to influence broader money creation via the banking system. Banks use these reserves to lend, multiplying the money supply through fractional reserve banking.

As of November 2025, the monetary base stood at approximately $5.302 trillion, down from $5.362 trillion in October 2025 and reflecting a year-over-year decline. Historically, it peaked at $6.413 trillion in December 2021, highlighting its volatility in response to policy shifts. Think of MB as the "seed money"—it's not what everyday people use for transactions but the fuel for banks to create more.

M1: The Narrow Measure of Transactional Money
M1 is the first broad aggregate, focusing on the most liquid forms of money that can be immediately used for purchases. It's designed to capture money's role as a medium of exchange. Components include:

• Currency outside banks (physical cash held by the public).
• Demand deposits (checking accounts that can be withdrawn on demand without notice).
• Other liquid deposits, such as savings deposits and money market deposit accounts (included since May 2020 due to regulatory changes that blurred the lines between checking and savings).

Before 2020, M1 was narrower, excluding most savings deposits, but the Fed redefined it amid pandemic-era rule changes that eliminated reserve requirements and transaction limits on savings accounts. This redefinition caused a sharp jump in reported M1 figures.

M1 is vital for understanding day-to-day economic activity—high M1 growth might signal increased spending, while stagnation could indicate caution. As of October 2025, M1 reached $19.004 trillion, up from $18.913 trillion in September, with a year-over-year growth of 4.42%. By November 2025, it edged higher to about $19.026 trillion.

M2: The Broader Measure of Near-Money
M2 builds on M1 by including slightly less liquid assets that can still be quickly converted to cash. It reflects money's function as a store of value in addition to a medium of exchange. M2 comprises:

• Everything in M1.
• Small-denomination time deposits (certificates of deposit under $100,000 that have a fixed maturity).
• Retail money market mutual fund shares (excluding institutional funds and retirement accounts like IRAs).

M2 is the most watched aggregate because it correlates strongly with inflation and economic cycles—economists like Milton Friedman famously noted that "inflation is always and everywhere a monetary phenomenon," often linking it to M2 growth. It's broader than M1 but still excludes large institutional deposits or stocks/bonds.

Recent data shows M2 at $22.322 trillion in November 2025, up from $22.298 trillion in October, with a year-over-year growth rate of about 4.27%. This marks a recovery from earlier contractions, as we'll discuss next.

Changes in the US Money Supply Since 2021
Since 2021, the US money supply has undergone dramatic shifts, largely driven by the Federal Reserve's response to the COVID-19 pandemic, inflation surges, and subsequent policy normalization. The story begins with explosive growth: From 2019 to 2021, M2 surged by 38.5%, the largest increase since 1960, fuelled by massive fiscal stimulus (trillions in relief packages) and the Fed's quantitative easing, which flooded the system with liquidity to support recovery. M1 saw even more volatility due to its 2020 redefinition, jumping from around $5.5 trillion pre-redefinition to over $18 trillion by early 2021. The monetary base also ballooned, peaking at $6.413 trillion in December 2021 as the Fed bought assets to keep rates low.

However, this expansion contributed to soaring inflation, hitting 9.1% in mid-2022. In response, the Fed pivoted to aggressive tightening: hiking interest rates from near-zero to over 5% and implementing quantitative tightening (QT), allowing its balance sheet to shrink by not reinvesting maturing securities. This led to a historic contraction—M2 fell by 4.76% from April 2022 to October 2023, one of the most notable declines in modern-era data. M1 stabilized around $18-19 trillion after initial post-redefinition volatility, while the monetary base contracted steadily, dropping to about $5.3 trillion by late 2025.

By 2024-2025, with inflation cooling to target levels, the Fed began easing rates, fostering modest re-expansion. M2 grew 4.6% year-over-year in October 2025, reaching highs around $22.3 trillion, while M1 advanced 4.42% year-over-year to $19 trillion. These changes underscore the Fed's balancing act: rapid expansion averted economic collapse but sparked inflation, while contraction tamed prices but risked slowdown. As of late 2025, the money supply appears on a path of steady, controlled growth, supporting recovery without reigniting overheating. Monitoring these aggregates remains key for investors and policymakers alike.