In 1980 a college graduate might earn 38 percent more than someone with only a high school diploma. Recent census data projects a 73 percent differential in 2011. As the lives of high school and college graduates move farther apart, Stanford economist Rebecca Diamond says Americans are becoming geographically segregated by education and not just by neighborhoods, but by whole cities. She calls it national gentrification. As highly educated people flock to New York, Boston and San Francisco and other major urban centers, amenities they want increase and people with lesser education are edged out by the loss of low skilled jobs and rising rents. Diamond says the trend furthers economic wellbeing inequality. Read Emily Badger’s Washington Post Wankblog story here.