This chart shows the M1 Money Supply in the United States — a narrow measure that includes currency, demand deposits, and other liquid deposits (including savings deposits since May 2020). M1 represents the most liquid portions of the money supply: cash and assets that can be quickly converted to cash. The data is sourced from the Federal Reserve Bank of St. Louis (FRED series M1SL) and is reported monthly. Overlaying equity indices like the S&P 500 can help visualize how monetary expansion correlates with asset price appreciation over time.