America was once a nation in constant motion: One in three Americans moved every year in the 19th century, chasing opportunity from one town to the next. But that mobility has collapsed, falling by more than half since 1970. In this episode, University of Chicago economist Peter Ganong and Atlantic deputy executive editor Yoni Appelbaum explore how housing regulations have created a two-tier system where only high earners can afford to move to opportunity-rich cities.

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