In total, almost half of college graduates move out of their birth states by age 30. Only 27% of high-school graduates and 17% of dropouts do so. This is an important reason for the increasing inequality in income and unemployment rates between workers with college education and workers with less education. A college graduate today makes 75% more than a high-school graduate. This salary difference is more than double what it was in 1980, and an increasing part of this difference reflects differences in mobility.