In the book, you stress that american growth rates have been declining. But if there are increasing returns to scale at the national level, shouldn't growth rates be going up? You might think, well, there's increasing returns within a city, but not within a country. The u s as a whole, the population has become more dispersed. So doesn't that mean actually, there aren't increasing returns to scale? Oh, i sa ye. Some of the deep structures of economic growth do have to do with our basic ability to exploit natural resources....

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