M1 A category of the money supply that includes all physical money such as coins and currency; it also includes demand deposits, which are checking accounts, and Negotiable Order of Withdrawal (NOW) Accounts. Investopedia Says: This is used as a measurement for economists trying to quantify the amount of money in circulation. The M1 is a very liquid measure of the money supply, as it contains cash and assets that can quickly be converted to currency. Related Terms: Checking Account Currency M0 M2 M3 Monetary Policy Money Supply Narrow Money NOW Account |