WASHINGTON — U.S. services firms grew at a slower pace in April compared to the prior month, as companies are reporting cost pressures from possible tariffs and a shortage of available workers.

The Institute for Supply Management said Thursday that its services index fell to 56.8, from 58.8 in March. This marked the lowest reading of the index this year. Still, any reading above 50 is a sign of expansion. The services sector has been expanding for the past 99 months, or more than eight years.

The index is drawn from a survey of purchasing managers in the services industry, which includes finance, health care and retail and accounts for the majority of U.S. economic activity. Multiple companies said there is a lack of workers, specifically in the trucking and construction sectors. Other companies noted that the tariffs proposed by President Trump appear to be driving prices higher.

“There is some inflation creeping in – it’s not very sharp,” said Anthony Nieves, who chairs the ISM’s non-manufacturing business survey committee.

The outlook was generally positive about the economy continuing to expand. All 18 industries surveyed for the index said they were expanding. One management firm quoted in the report said that the tax cuts Trump signed into law were helping.

The employment and production components of the index decreased in April, although both pointed to continued growth. New orders rose in a sign that companies are seeing solid demand.

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