Food-away-from-home prices rose 3.5% year over year in September, outpacing both grocery inflation and the 3% gain in American hourly wages, according to federal data released Wednesday.

The split inside the restaurant industry was narrow but real: limited-service menu prices climbed 3.2%, while full-service prices rose 3.8%. Both figures came in below the overall consumer price index, which jumped 0.6% month over month and 3.7% over the past year.

The grocery gap is the sharper one. Food-at-home prices were flat in September and up only 2.5% over 12 months. That leaves restaurant pricing running a full percentage point ahead of the supermarket — a spread that pushes value-sensitive diners toward eating at home.

What does this change for operators?

The wage line answers the practical question. Hourly earnings rose 3% over the past 12 months, according to the U.S. Bureau of Labor Statistics. With menu prices up 3.5% and wages up 3%, consumer spending power effectively fell 0.7% over the year. Diners are not imagining that restaurant checks feel heavier.

That erosion shows up in sentiment data. The University of Michigan's Survey of Consumers recorded a 13.6% year-over-year decline in consumer sentiment in October.

It also shows up in sales data. Quick-service restaurant sales rose just 0.6% in the third quarter, according to Revenue Management Solutions, with traffic down 2.6% over the same period. When nearly all of a chain's sales growth comes from price rather than transactions, each additional price increase carries more risk of trading customers down or out.

The pressure lands on chains already fighting traffic declines. Raising prices further widens the gap with grocery and accelerates the shift to home meals; holding prices flat compresses margins unless commodity and labor costs cooperate.

The macro spillover

Markets reacted quickly. The inflation data sent stocks down more than 1% on Wednesday, and the report raised the odds of further interest rate increases as the U.S. Federal Reserve works to slow inflation. Higher rates raise financing costs for expansion and refinancing across the sector.

The September numbers frame the central pricing question for the months ahead: with spending power down 0.7% and quick-service traffic down 2.6%, the chains that keep growing will be the ones that find margin somewhere other than the menu price.