Federal Reserve Chairman Kevin Warsh has reintroduced the M2 money supply measure as a key gauge for monetary policy, a shift that markets are already pricing in. A prediction market now gives a 33.5% probability of a rate hike by September 2026, the first concrete signal from traders since the announcement.
Why M2 Matters Again
M2 — a broad measure of money that includes cash, checking deposits, and savings accounts — fell out of favor at the Fed after the 2008 financial crisis, when quantitative easing warped its relationship with inflation. Warsh's decision to bring it back suggests the central bank is looking for new tools to assess whether the economy is overheating or cooling.
In his first major policy address since taking the helm, Warsh said M2 could offer a more direct read on how much liquidity is sloshing through the system. The move comes as the Fed debates whether its current rate stance is tight enough to bring inflation down to its 2% target.
The Prediction Market Signal
Traders on a leading prediction platform have assigned a 33.5% probability to a rate hike by September 2026. That's not a majority view, but it is a notable shift from earlier this year, when the same market saw the odds of a rise as near zero. The figure implies that roughly one in three traders expects the Fed to tighten, not loosen, within the next two years.
The reassessment follows Warsh's comments and the release of the latest M2 data, which showed the money supply growing at a slightly faster clip than anticipated. Analysts caution that prediction markets are volatile and can swing on a single data point, but the 33.5% figure is the first market-based estimate of future rate moves since the Fed changed its framework.
What the Data Shows
M2 growth has been running at about 3% annually in recent months, well below the double-digit spikes seen during the pandemic but above the sluggish pace of the early 2020s. The Fed had previously de-emphasized M2, arguing that financial innovation made it less reliable. Warsh's revival of the metric signals a return to a more traditional monetary analysis.
Critics inside the Fed have questioned whether M2 can still predict inflation in a world of digital payments and non-bank lending. But Warsh's supporters say the measure is a useful sanity check against other indicators, such as the employment cost index and core PCE inflation.
Next Steps for Markets
The Fed's next policy meeting is scheduled for May 2026, followed by a quarterly press conference in June. Markets will be watching closely to see whether Warsh's emphasis on M2 translates into any change in the statement language or the dot plot of rate projections. If the prediction market's 33.5% probability rises above 50%, the debate over a rate hike could dominate the summer.
For now, the odds are still stacked against a move. But with Warsh putting M2 back on the table, the old guard of monetary indicators is making a comeback — and the rate path is no longer a one-way bet.
