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Culture War Roundup for the week of January 9, 2023

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Similarly, the number of people moving into a city will be upper bounded by some multiple of the number of salaried jobs that the city can support.

And it historically kept being met. In the 1980s people randomly decided that cities around the world were 'full'. By what mechanism did the degree of fullness get determined and why stop at this arbitrary time in the late 20th century ?

The 80s were the inflection point of an economic change, where now the number of salaried jobs increases as the people in the city increase. In the old days, a city would be built around a resource, often a trade route, that had some absolute size of economic surpluss to be extracted. There were jobs for the people extracting it, those brought people in, then there were jobs for services for those people, which brought more people in, etc, but this would taper off quickly and the population stayed limited. Then with industrialisation, you could create surplus anywhere. But you still need food as an input for the workers, and initially that still limited the growth of the cities by how far it could (afford to) be transported. But eventually, technology became so good that its now basically irrelevant where a city is. Really only container ship access matters, and thats a matter of if. ~Noone who has it is physically blocked from expanding it. Now, the best place to run your generic company is in the biggest city, and so it the best place to look for a job, and the only price that can go against it is that of the space.

If you solve this by just building ever more, the result is maybe ten gigantic cities in the whole world (plus small mining towns scattered far apart). And that might be the most efficient thing to do in some sense, but housing still wont be as cheap as it used to. Things just want to clump together now, and they will always want a bit more.