(CNN) — US inflation cooled off at the wholesale level as businesses’ margins took a big hit in August, new data showed Wednesday.

Producer prices unexpectedly fell 0.1% in August, cooling annual inflation to 2.6% from a downwardly revised 3.1% in July, according to Bureau of Labor Statistics data.

Helping to drive prices lower was a 1.7% drop in trade services, a category reflective of producers, wholesalers and retailers’ profit margins. If margins are shrinking, it could be an indication that businesses are using those to eat higher costs, economists have said.

The trade services category can be highly volatile; however, August’s drop is the biggest monthly decline there in more than a year.

When excluding highly volatile components like trade services, as well as food and energy,

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