US Consumer Prices Rise 0.4% in October, Exceeding Expectations

US consumer prices rose by 0.4% in October, surpassing economists' expectations of a 0.3% increase, according to the Bureau of Labor Statistics. Core consumer price index (CPI), which excludes volatile food and energy prices, increased by 0.3%, higher than the forecasted 0.2%. The headline CPI had previously risen 0.6% in September, with core CPI also up 0.3% that month. Annual inflation figures for October were unavailable due to last year's government shutdown.

Energy costs rose 0.7% driven by a 1% increase in gasoline prices, despite a recent fall in gasoline prices, while natural gas prices fell 0.8%. Food costs grew by 0.5%, including increases in snacks (1%), beef (0.9%), and meats, poultry, fish, and eggs (0.5%). Transportation services increased 0.8%, with new vehicle prices up 0.2% and used cars and trucks down 1.2%. Shelter costs increased by 0.3%, accounting for over 30% of the headline CPI rise. Other notable increases included medical care commodities at 0.5% and airline fares at 0.4%.

Following the data release, stock market futures declined, and Treasury yields increased as traders priced in a full 0.25 percentage point interest rate hike by the Federal Reserve at its December 8-9 meeting. The likelihood of a larger 0.5 percentage point hike rose to 13.6%, up from near zero before the report. Federal Reserve officials had maintained rates between 3.75% and 4% at their October meeting. Comments from Federal Reserve officials suggested the inflation data could influence a stronger rate increase to manage inflation pressures.

This matters to investors because the higher-than-expected inflation figures increase the probability of a Federal Reserve rate hike, directly affecting borrowing costs, bond yields, and stock market performance linked to interest rate changes.