From 1947 to 1969, nearly 20 percent of the American population moved every year, as they relocated to new areas offering economic growth and opportunity.  Since then, mobility has steadily declined, to 15 percent in 2000, and to 11.9 percent in 2007 — a forty percent decline versus the average year between 1947 and 1969.  What has changed that has led to this decline?
First, the population of the country is getting older – and older people are less likely to move.  Second, the growing incidence of two worker couples impedes …