US wholesale inflation remained stubbornly elevated last month, another sign that even higher prices could be ahead for American shoppers.

The producer price index for final demand climbed 0.4% from a month earlier, and that after an upwardly revised 0.5% increase in December, the Bureau of Labor Statistics said Thursday. The data on wholesale prices comes just a day after a consumer price index report showed underlying inflation at its highest in more than a year.

Producer costs are those paid by businesses and are often passed on to customers. The PPI report follows Wednesday’s consumer price index for January that saw inflation rise by 0.5% and 3% for the year.