Despite surging second-quarter economic growth and tight labor markets, wholesale prices remained unchanged last month, the Labor Department said.

The stable prices at the producer level offer a further sign that inflation is under control, analysts said. Bonds were up sharply on the news Friday, with the Treasury Department’s benchmark 30-year issue closing Friday at 100 23/32, up 23/32 point.

"It just doesn’t get much better than this," with declining inflation and strong real growth, said Chris Varvares, a forecaster at Macroeconomic Advisers L.L.C. in St. Louis. The producer price index, which tracks price fluctuations at the producer level, and the consumer …