Prediction Markets Weekly: Fed Rate Path Holds Steady, CPI Markets Price Modest Inflation

The Federal Reserve rate path market has held steady through mid-September, with Kalshi contracts pricing a 49% probability that the upper bound of the federal funds rate will remain above 4% following the January 2027 FOMC meeting. The implied probability for rates above 3.75% sits at 76%, while the market assigns just 17.5% chance to the upper bound exceeding 4.25%. Those probabilities have been largely unchanged over the past week, suggesting event markets are in a wait-and-see mode ahead of the next data releases.

The conventional instrument cross-check shows the 2-year Treasury yielding 4.65% as of September 14, which aligns reasonably well with the Kalshi strip. If the market truly believed rates would drop below 4% with 51% probability, the 2-year yield would likely compress further. The 5-year breakeven inflation rate at 2.41% suggests market participants expect inflation to run modestly above the Fed's 2% target over the medium term, consistent with the current policy rate of 3.75%.

CPI markets for the September print are pricing modest inflation expectations. The contract for CPI rising more than 0.6% in September trades at just 17% implied probability, while the 0.5% threshold contract sits at 45.5%. This suggests the market anticipates a print somewhere in the 0.3% to 0.5% range, which would represent a deceleration from recent months. Volume in the September CPI contracts is elevated at over $59,000 in the 0.6% threshold market, indicating genuine liquidity as traders position ahead of the October 14 release. The negative threshold contracts all trade above 99%, effectively expressing certainty that September CPI will not decline on a monthly basis.

GDP markets for the third quarter of 2026 show modest growth expectations. The contract for real GDP increasing more than 4.0% trades at just 15% implied probability, while the 3.5% threshold sits at 31%. The market prices a 98% probability of positive growth, indicating recession fears are not reflected in current pricing. The strike at 2.0% growth trades at 51%, suggesting the market's central expectation is roughly 2% quarter-over-quarter growth. Volume is concentrated in the 4.0% threshold contract at over $68,000, with liquidity thinning rapidly on either side of that strike.

Liquidity across the Fed rate path contracts varies by strike and expiration. The January 2027 contracts show reasonable volume, with the 3.25% threshold trading over $12,700 and the 3.50% threshold at just over $7,000. Wider strikes like 4.25% see thinner volume at under $1,400, which explains some of the price volatility in those tails. The bid-ask spread on the 4.25% contract is visibly wide at 0.11 to 0.24, reflecting that illiquidity. Tail probabilities can move disproportionately to news flow in thin order books like the 4.25% strike.

No markets from our previous coverage resolved this week, so there are no resolution results to report. The next significant resolution dates on the calendar are the September CPI print on October 14 and the Q3 2026 GDP release on October 30. Both of those events should drive meaningful price action across their respective contract families.

The conventional markets and event markets are broadly aligned on the macro outlook. The 2-year Treasury at 4.65% and the Fed strip pricing 49% probability of rates above 4% are consistent with each other. The 5-year breakeven at 2.41% is slightly higher than the CPI market would imply for a single monthly print, but that reflects the breakeven's longer time horizon and risk premium. The GDP contracts pricing 51% probability of growth above 2.0% match the consensus view of modest but positive economic expansion.

Event markets continue to provide real-time expectations of economic outcomes. The Fed strip shows the market does not expect aggressive easing in the near term, with just 24% probability assigned to rates below 3.75% by January 2027. The CPI markets are positioning for a deceleration in inflation momentum, though not outright deflation. The GDP contracts are pricing recession risk as low for the current quarter. These probabilities will update as new data arrives, providing a continuous read of market expectations.

This content is for informational purposes only and does not constitute financial advice. Past performance is not indicative of future results. Consult a qualified financial advisor before making investment decisions.