U.S. inflation has remained above 2% for roughly 65 consecutive months, the longest uninterrupted stretch of the 21st century in CNBC’s review of Bureau of Labor Statistics data. September’s consumer price index rose 3.7% from a year earlier and 0.6% from August, with gasoline responsible for more than half of the monthly increase.
The persistence matters because inflation is partly about behavior. If households and businesses expect prices to rise quickly, workers may seek larger wage increases, companies may change prices more often and lenders may demand higher interest rates. Those choices can make inflation harder to reduce even after the original supply shock fades.
The 2% comparison needs care. The Federal Reserve formally targets 2% inflation as measured by the personal consumption expenditures price index, not CPI. CPI often runs at a different rate because its weights and housing methodology differ. Still, a long period of CPI above 2% shapes public experience and can weaken confidence that the Fed will return inflation to its goal.
Expectations are the transmission channel
Cleveland Fed President Beth Hammack described it as concerning that consumers were beginning to treat high inflation as a “fact of life.” The University of Michigan’s one-year expectation reportedly rose to 3.9% in September. Short-term expectations often respond to gasoline and food prices, so one survey does not prove that long-run expectations have become unanchored. The Federal Reserve’s July monetary policy report also noted that survey measures could move sharply while market-based and professional forecasts sent different signals.
The policy trade-off is therefore more difficult than a single CPI release suggests. Higher rates can restrain demand and reinforce credibility, but they cannot produce oil or immediately reverse a geopolitical supply shock. Keeping policy too tight also risks unnecessary damage to employment and investment.
Investors should separate three questions. First, is monthly inflation broadening beyond gasoline? Second, are medium- and long-term expectations rising across several surveys and market measures? Third, is wage growth consistent with lower inflation after productivity gains? The October 27-28 Federal Open Market Committee meeting will have to balance those signals.
The key risk is persistence rather than one hot month. If households continue to believe inflation will remain near 4%, the Fed may need tighter policy for longer. If energy prices ease and broader inflation slows, the September jump could prove less durable than the headline suggests.