AT least one part of the labor force has expanded significantly since 
the recession hit: the low-wage part, made up of burger flippers, home 
health aides and the like. 
Put simply, the recession took middle-class jobs, and the recovery has 
replaced them with low-income ones, a trend that has exacerbated income 
inequality. According to Labor Department data, about 1.7 million workers
 earned the minimum wage or less in 2007. By 2012, the total had surged 
to 3.6 million, with millions of others earning just a few cents or 
dollars more.         [Read more]