U.S.-made products are losing market share to imports across a wide range of core industries in the United States, according to a new study. Among 114 product categories, U.S.-based producers boosted their domestic market share in only three categories between 1997 and 2005: heavy trucks and chassis, computer storage devices, and computer chips. Imports gained market share in 111 categories. The survey from the U.S. Business and Industry Council, a nonprofit group in Washington of small and midsize manufacturers and a critic of U.S. trade policy, used Census Bureau data. The survey excluded inexpensive consumer products found in Wal-Marts, Targets...