I was then surprised to read this article in the SFGate (SF Chronicle) that Silicon Valley and SF lead the nation in social mobility. Economists define social mobility
as the probability of moving from the bottom 20% to the top 20% of income distribution. “In Silicon Valley, 12.9 percent of children
born into the lowest income bracket move to the top. San Francisco: 12.2
percent. Washington, D.C., Seattle, Salt Lake City, New York, Boston and San
Diego come in next. Worst odds: Charlotte, N.C., where just 4.4 percent of children have moved from bottom to top. Children in Milwaukee and Atlanta have fared little better.” So, social mobility is 3x higher in Silicon Valley than in Atlanta.