Jackson Hole changed the September Federal Reserve debate.
Before Fed Chair Kevin Warsh’s August 28 speech, markets saw a rate increase as possible but far from certain. After the speech, fed-funds futures priced roughly a 57% chance of a hike at the September FOMC meeting.
Warsh did not promise a rate increase. But he gave markets the clearest signal yet that the Fed is prepared to tighten policy again if inflation does not improve.
What Did Warsh Actually Say?
Warsh focused heavily on inflation.
His standard was clear: policymakers need confidence that underlying inflation is moving toward the Fed’s 2% objective clearly and at sufficient speed. If not, the Fed still has work to do.
He also argued that financial conditions do not look particularly restrictive. Credit spreads remain relatively tight, equity volatility is low and the labor market has not shown the kind of collapse that would normally force the Fed to prioritize growth over inflation.
Did Warsh Commit to a September Hike?
No.
A September hike is still conditional. Warsh has also criticized excessive forward guidance and does not want the Fed to lock itself into a move before seeing the data.
The most important near-term release is the August jobs report on September 4. A strong payroll number and stronger wage growth would make another hike easier to justify. A weak report could reduce the probability significantly.
The correct interpretation is not “the Fed will raise rates in September.” It is that the hurdle for another hike is much lower than markets assumed before Jackson Hole.
Why Does This Matter for the S&P 500?
Higher interest rates increase borrowing costs and raise the return available on safer assets such as Treasuries.
For growth stocks, higher yields also reduce the present value of future earnings. That is why high-multiple technology stocks can come under pressure even when revenue growth remains strong.
The market is currently balancing two powerful narratives: AI earnings are strong, but inflation is keeping the Fed hawkish.
What Should Investors Watch Next?
Watch three things:
- the August payroll report, - short-term Treasury yields and fed-funds futures, - and rate-sensitive sectors such as technology, homebuilders, small caps and financials.
Jackson Hole did not settle the September decision. It changed the burden of proof.