rolling back income inequality won’t make any difference in the isolation of the new upper class from the rest of America. The new-upper-class culture is not the product of great wealth. It is enabled by affluence—people with common tastes and preferences need enough money to be able to congregate—but it is not driven by affluence. It is driven by the distinctive tastes and preferences that emerge when large numbers of cognitively talented people are enabled to live together in their own communities. You can whack the top income centile back to where it was in the 1980s, and it will have no
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