In the January 12, 2010 Wall Street Journal article " Even in a Recovery, Some Jobs Won't Return ," Justin Lahart explains some of the structural changes in the U.S. labor market. Even when the U.S. labor market finally starts adding more workers than it loses, many of the unemployed will find that the types of jobs they once had simply don't exist anymore. The downturn that started in December 2007 delivered a body blow to U.S. workers. In two years, the economy shed 7.2 million jobs, pushing the jobless rate from 5% to 10%, according to the Labor Department. The severity of the recession is reshaping the labor market. Some lost jobs will come back. But some are gone forever, going the way of typewriter repairmen and streetcar operators. Many of the jobs created by the booms in the housing and credit markets, for example, have likely been permanently erased by the subsequent bust. "The tremendous amount of economic activity associated with housing, I can't