none of this sorting would happen if the less-well-off could follow the better-off into their enclaves. There would be no escaping the mixed, integrated community. In the United States, the price of housing, maintained at a high level by zoning laws that effectively limit the construction of low-income housing, keeps the unwanted lower classes out of a higher-class neighbourhood or out of a desirable city. Conversely, in declining communities hit by trade, we have seen that the better-educated management workers move out, accelerating the decline in the remaining community. The net effect of
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