The M2 Money Stock is a measure of the amount of money available in an economy, which includes various types of liquid assets.

In the graph, the "M2 Money Stock" refers to the US money supply issued by the FRED (Federal Reserve Economic Data).

M2 includes cash in circulation, demand deposits in financial institutions (such as checking accounts), time deposits in financial institutions, money market funds, and other liquid assets.

The M2 is a metric that economists and economic policy makers use to monitor the amount of money available in the economy and to understand liquidity conditions.

Control of the money supply is a key tool used by central banks to influence economic conditions, such as inflation and economic growth.

The graph shows the growth of M2 by subtracting the value of the current month from the previous month.

Data is taken from fred.stlouisfed.org