After long-awaited government data showed underlying US inflation cooled to a four-year low in November, economists agreed on at least this much: something was off.

In a report fouled by the record-long government shutdown, inflation in several categories that had long been stubborn seemed to nearly evaporate. Chief among those were shelter costs, which make up about a third of the consumer price index, but other categories like airfares and apparel notably declined.

Because of the shutdown, the Bureau of Labor Statistics couldn’t collect prices throughout October and started sampling later than usual in November. The so-called core CPI, which excludes food and energy, increased 2.6% in November from a year ago — the slowest pace since 2021 and below all estimates in a Bloomberg survey of economists.

Several forecasters pointed to the absence of that October data — which resulted in pages of blank spaces in the widely watched report — as effectively the same as assuming no price growth for the month. That culminated in sizable downward pressure on the November inflation figures, they said. Some noted the shortened collection period could have also skewed the data.