U.S. producer prices fell in May after two month of solid gains, but the decline was not enough to change perceptions that inflation pressures are steadily creeping up. The Labor Department said on Friday its producer price index for final demand slipped 0.2 percent after advancing in April by 0.6 percent, which was the largest gain in 1-1/2 years. Economists, who had expected producer prices to edge up, saw the decline as a correction after gains in March and April, and said it did not change their view that prices were firming. true "The net result is a pick-up. The net strengthening makes the modest acceleration in the more important consumer inflation measures more credible," said Jim O'Sullivan, chief U.S. economist at High Frequency Economics in Valhalla, New York. The government revamped the PPI series at the start of the year to include services and class="mandelbrot_refrag"> construction . Big swings in prices received for trade servi