The IMF’s October 2026 World Economic Outlook, released October 13, serves as the dominant catalyst anchoring the 59.2% market-implied probability on 3.1% world GDP growth for the year. The Fund upgraded its projection 0.1 percentage point from July, citing resilient AI-driven investment and fiscal support that have offset the energy-price shock from the Middle East conflict, even as global inflation is expected to reach 4.7%. This figure sits above some private-sector consensus estimates near 2.6% yet aligns with trader positioning that treats the IMF baseline as the central case. Downside risks from further geopolitical escalation or fading AI momentum keep probabilities on adjacent outcomes such as 3.0% and 3.2% elevated, while the proximity to year-end data releases leaves room for modest revisions before final figures are compiled.