Inflation Jumped — Why Stocks Rallied Anyway
Inflation accelerated in August and the market pushed Federal Reserve rate-hike odds toward 90% — but the S&P 500 rallied anyway. Investors now turn to Wednesday’s Fed decision to see whether policymakers view the rebound as temporary or a sign that inflation is becoming harder to contain.
September 12, 2026
Inflation Jumped in August — Stocks Rallied Anyway
Inflation accelerated in August, with consumer prices rising 0.4% after increasing just 0.1% in July. Federal Reserve rate-hike odds climbed to nearly 90% — yet the S&P 500 gained 0.9% Friday. Investors appeared relieved that inflation matched forecasts instead of delivering an even hotter surprise. Now the focus shifts to how the Fed interprets the rebound.
Watch Today’s Market Breakdown
See why stocks rallied despite hotter inflation, what pushed rate-hike odds toward 90%, and why Wednesday’s Federal Reserve decision is the next major test.
Today’s Market Setup
Friday’s market reaction created an unusual-looking combination: faster inflation, sharply higher expectations for a Fed rate hike, and a rising stock market. The explanation appears to be less about inflation being good news and more about the report not being worse than investors expected.
Inflation Accelerated
Consumer prices rose 0.4% in August after increasing 0.1% in July. Gasoline prices jumped 3.9%, adding another source of pressure to the headline inflation number just before the Federal Reserve’s next decision.
Rate-Hike Odds Near 90%
The market’s implied probability of a Federal Reserve rate hike next week climbed to nearly 90%, up from 72% Thursday. That puts Wednesday’s Fed decision directly at the center of the market’s next major catalyst.
Stocks Rallied Anyway
Despite the inflation rebound, the S&P 500 gained 0.9% Friday. The headline number matched forecasts, while oil pulled back after this week’s surge, and investors appeared relieved that the inflation report was not worse.
What Matters From Here
Friday explained how investors reacted to the inflation report. The bigger questions now center on whether that reaction can hold and how policymakers interpret the renewed inflation pressure.
- Does the Federal Reserve view August’s inflation rebound as temporary, or as evidence that price pressure is becoming stickier?
- Can stocks maintain Friday’s strength with the market assigning nearly a 90% probability to a rate hike?
- Does oil continue pulling back after this week’s surge, or does energy remain an important source of inflation pressure?
The Headlines Are Only the First Step
The free Market Preview explains why inflation accelerated, why stocks rallied anyway, and why Wednesday’s Fed decision matters. The members-only Daily Market Brief goes deeper into the catalysts, risks, confirmation signals and developments worth monitoring as the market evaluates the inflation rebound and the Fed’s response.
See What Members GetInside Today’s Members-Only Daily Market Brief
- The signals worth monitoring around Wednesday’s Fed decision as policymakers assess whether the inflation rebound is temporary or more persistent.
- What could help confirm whether Friday’s S&P 500 rally can hold with rate-hike expectations now near 90%.
- Why gasoline and the direction of oil remain important pieces of the inflation setup after this week’s energy-market volatility.
- The developments that could show whether investors remain comfortable with inflation matching forecasts or begin reassessing Friday’s relief-driven reaction.
Go Beyond the Headlines
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