The biggest issue facing the American economy, and our political system, is the gradual descent of the middle class into proletarian status. This process, which has been going on intermittently since the 1970s, has worsened considerably over the past five years, and threatens to turn this century into one marked by downward mobility.

The decline has less to do with the power of the ‘one percent” per se than with the drying up of opportunity amid what is seen on Wall Street and in the White House as a sustained recovery. Despite President Obama’s rhetorical devotion to reducing inequality, it has widened significantly under his watch. Not only did the income of the middle 60% of households drop between 2010 and 2012 while that of the top 20% rose, the income of the middle 60% declined by a greater percentage than the poorest quintile. The middle 60% of earners’ share of the national pie has fallen from 53% in 1970 to 45% in 2012.

This group, what I call the yeoman class – the small business owners, the suburban homeowners , the family farmers or skilled construction tradespeople – is increasingly endangered. Once the dominant class in America, it is clearly shrinking: […]