CPI core year-over-year in Sep 2026?

On Kalshi, this market is priced through a continuous double auction, meaning traders buy and sell contracts representing different CPI core year-over-year values. The price of each contract reflects the probability of that outcome occurring, as perceived by the market participants. On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. The market dynamically adjusts as new information becomes available and traders update their expectations. This creates a fluid and responsive pricing mechanism, offering a unique view of future economic conditions.

This market resolves around Oct 14, 2026, with the outcome confirmed once the official CPI core year-over-year inflation rate for September 2026 is verifiable from credible public reporting. The resolution will be based on the data released by the relevant government agency responsible for tracking and publishing CPI figures. Traders will then be paid out based on whether their predicted outcome matches the reported value. This provides a clear and objective determination of the market’s result.

Several key economic signals could significantly impact this market. Unexpected shifts in employment data, changes in energy prices, or surprising announcements from the Federal Reserve regarding monetary policy are all potential catalysts. Geopolitical events and supply chain disruptions could also play a role, influencing inflation expectations. Furthermore, any revisions to previously reported economic data could cause traders to reassess their positions, leading to price fluctuations in this market. Monitoring these factors will be crucial for understanding market movements.