M1 money supply is a measure of currency in circulation, not including money stored in Federal Reserve vaults. This chart from the Federal Reserve shows the M1 money supply of the U.S. dollar.

M1 is essentially money that can be spent ... It's also the specific money supply measure that's cause for concern on Wall Street. Normally, the M2 chart slopes up and to the right.

bitcoin would be a top-10 global currency by liquid money supply. Bitcoin could be considered a top-10 global currency based on its “stock of narrow money” or M1, the money supply that is composed of ...