The total stock of monetary assets, currency and other liquid instruments, in an economy (country) or economic area (e.g. the euro area, known as the euro zone) at a point in time. Each country decides what assets are included. Typically, these assets are classified as follow: M0 and M1 include coins and notes in circulation and other money equivalents that are easily convertible into cash. M2 includes M1 plus short-term time deposits in banks and 24-hour money market funds. M3 includes M2 plus longer-term time deposits and money market funds with more than 24-hour maturity. M4 includes M3 plus other deposits.