Belongs to M2. Economists call the currency that can be directly used as a medium of exchange M 1, or the currency in a narrow sense, and the currency including other currencies M2, or the currency in a broad sense. M 1 includes cash (banknotes or tokens), traveler's checks, current deposits or other checking deposits. These currencies can be directly used as a medium of exchange for various transactions and payments. M2 is based on M 1 plus other savings deposits (such as bank time deposits, money markets, fund balances and deposits of other financial institutions). The amount of money flowing is also called money stock.