Behind the Car Sales Boom: Piles of Cash on the Hood

Chevy Silverado pickup trucks sit on display at a General Motors dealership in Peoria Photograph by Daniel Acker/Bloomberg

The economy may be having a car sales party, but automakers are spiking the punch. U.S. auto incentives in May jumped to 8 percent of market value—or almost $2,500 per vehicle—marking the highest level in about two years, according to data released Tuesday by Edmunds.com.

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