The U.S. economy grew at an annual rate of 5.3 percent in the first quarter, faster than the government initially estimated, as companies replenished inventories and shipped more goods overseas.`The first quarter was unambiguously strong, but the issue now is how much of that is going to carry into the second quarter,'' Chris Low, chief economist at FTN Financial in New York, While the economy may be starting to cool, there are some signs of building inflationary pressures. Today's report showed wages and salaries rose at a 5.8 percent annual rate in the first quarter, up from a 1.6 percent pace in the prior three months. Fourth-quarter wages were previously reported as rising at a 4.8 percent annual rate.bloomberg