With new home slaes down 10.5 percent in February, and with home prices declining for the fourth month in a row, it's high time for a sober look at the consequences of a major housing correction. The Federal Reserve, Wall Street economists, and other observers of the U.S. economy are closely watching the housing market because it has been a key driver of economic growth over the past several years. Roughly a quarter of the jobs created since the 2001 recession have been in construction, real estate, and mortgage finance. Even more important, consumers have withdrawn $2.5 trillion in equity...