Selling picked up the pace in the major averages in late-afternoon trading Tuesday. The Dow Jones industrial average fell 0.6%; the S&P 500 gave up 0.4% and the Nasdaq lost 0.3%. NYSE and Nasdaq volume was tracking about 5% to 10% lower than Monday’s levels. In the stock market today, U.K.-based AstraZeneca (AZN) lost 5% after the U.S. government released new rules to fight tax inversions, in which U.S. companies avoid U.S.