US Capitol with money illustration
The M2 money supply is seeing its longest stagnation since World War II, Jeremy Siegel said.
  • US money supply has seen its longest stagnation since World War II, according to Jeremy Siegel.
  • The Wharton professor said the US now faces major recession, unemployment, and deflation risks.
  • "You can't really have a growing economy when the M2 money supply is decreasing," Siegel told CNBC.

The US money supply is flashing a major warning to the US economy, according to Wharton professor Jeremy Siegel.

M2 money supply, which includes cash, checking deposits, and other highly liquid assets, bottomed out around $20.7 trillion in April this year amid aggressive rate hikes, according to Federal Reserve data. That's a 4% drawdown from the prior all-time-record of $21.7 trillion, which was recorded in 2021.