Staffing agencies are charging companies more for temporary workers, a possible harbinger of a bump up in salaries for permanent employees later this year.

The bill rate at Calabasas, California-based On Assignment Inc. (ASGN), which places temporary staff primarily in the information technology and health-care fields, climbed 6.3 percent in the quarter ended March 31 from the same time last year, the largest 12-month gain since 2008.

Agencies like On Assignment are the first to reflect shifts in wages because demand for their services is more immediate, prompting “real time” changes in fees, Sommer said. By contrast, he said, employers calibrate compensation for permanent workers less frequently, causing those adjustments to lag behind.

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