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Educated workers are flocking to San Francisco, the middle class is moving to Atlanta

Richard Florida and his colleagues at the Martin Prosperity Institute made the following chart illustrating class polarization in America's largest metropolitan areas by breaking down their net domestic migration levels according to educational attainment:

Matheson Chart by Zara Matheson

One unfortunate limit of this dataset is that by limiting itself to domestic migration, and not scaling for population size it creates a visual images that's a little excessively dominated by the idea of massive population loss in the New York City area.

But it paints a really excellent portrait of the dynamics in a place like San Francisco. Thanks to the booming high tech industry clustered in the Bay Area, highly educated workers are flocking to this metropolitan area. But development restrictions prevent Bay Area housing stock from expanding rapidly in response to this demand. The result is that instead of the boom trickling down to the area's working class residents, they're being pushed out by high housing costs. A similar overall trend, though less extreme, is happening in Seattle, Washington, Miami, and some other coastal cities.

By contrast Atlanta and Riverside are witnessing huge growth in its middle class even while losing highly educated workers due to a lack of prestige jobs and high-end amenities.

All in all, these kind of trends illustrate how housing patterns are reenforcing trends toward inequality. Both highly-skilled and less-skilled workers have higher earnings potential in San Francisco than Atlanta, and both highly-skilled and less-skilled workers have higher housing costs in San Francisco than Atlanta. But for the highly-skilled the San Francisco wage premium outweighs the San Francisco housing premium. For the working class, it doesn't. So less-skilled workers end up moving to Atlanta despite the worse job opportunities, driving a further wedge between the classes.