M2 includes a broader set of financial assets held principally by households. M2 consists of M1 plus: (1) savings deposits (which include money market deposit accounts, or MMDAs); (2) small-denomination time deposits (time deposits in amounts of less than $100,000); and (3) balances in retail money market mutual funds (MMMFs).
Release: H.6 Money Stock Measures
Board of Governors of the Federal Reserve System (US), M2 Money Stock [M2NS], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M2NS, April 30, 2016.
FRED BlogSpurious correlation