According to Mr. O'Shaughnessy, why did Revere Copper Products lose market share and have to downsize its U.S. plants? Tariffs on steel imposed in the 1990s failed to work. A strong U.S. dollar made imports cheaper and Revere and its U.S. customers could not compete Foreign labor force is more motivated and more productive than American workers The depreciation of the U.S. dollar against major foreign currencies made imports cheaper and Revere couldn't compete