There is no such thing as a city that has run out of room - The Washington Post

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Cities, in particular, are about tradeoffs between hectic streets and vibrant economies, between scarce parking and neighborhoods worth traveling to, between cramped subway cars and the mass of humanity that makes the subway possible.

And so, from an economist's point of view, there is no such thing as a full place. Especially not in America, where our neighborhoods, as urban planning professor Sonia Hirt puts it, are "astonishingly low density" compared to the rest of the industrialized world. Maybe your particular geology can't handle the foundation of a mile-high skyscraper. But, for the most part, we can always make choices to make more room, to build taller and denser, to upgrade schools and rethink roads to let more people in.

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There is no such thing as a city that has run out of room - The Washington Post