U.S. GDP is likely to grow for the first quarter (Q1) of 2013. The new number will be out on Friday, 26 April. Indeed, a number of market watchers have been anticipating the Q1 release. The current Wall Street Journal (WSJ) consensus forecast from economists (based on surveys during 5-9 April), for instance, anticipates 3.1 percent growth for Q1, up from 2.2 percent in WSJ's March survey. And the Conference Board's 10 April estimate has Q1 GDP growth at 3.5 percent, up sharply from 1.6 percent in its March 13 forecast. This rosy scenario is influenced by a number of factors: car sales are up, goods and services are up, business investment is up, home building is way up and inventories are up. Those are the basic components of GDP calculat...