Many people equate the American Dream with the attainment of a set of possessions -- a car and a home or a rising standard of living. Those are certainly desirable, but the more important element differentiating the U.S. economy from most others is social mobility.
America is losing its social mobility. What makes this particularly dangerous is that it represents a shift from historical patterns, and particularly attacks the bulk of the country, the middle and working class, in unprecedented fashion.