The Federal Reserve's total assets reflect the size of the central bank's balance sheet — including U.S. Treasury securities, mortgage-backed securities, and loans to financial institutions. Rapid balance sheet expansion (quantitative easing) typically coincides with accommodative monetary policy and rising asset prices, while contraction (quantitative tightening) signals a more restrictive stance. This weekly series from FRED (WALCL) is a key macro indicator for understanding liquidity conditions in the financial system.