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It's funny how people think a post-apocalyptic landscape will be relatively flat socioeconomically. At most they think there will be small-scale warlords or Dunbar-scale anarchist communes. No. There will be deathstar billionaires with private armies and narrow-deep tech stacks.
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Raw materials are likely to be a limitation here. Even if all the factories in your stack are in the same place (behind the same wall, protected by the same army) you still need your bottom level inputs.
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The modern tech stack has developed around global trade. Just like there are certain intermediate or finished products that are mostly only made in one place globally, the global tech stack allows some raw materials to come from one or two places globally.
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You’ll probably also miss out on economies of scale. I heard that all the window glass in the US comes from one factory. Assume that’s true. How much more expensive would it be to make make window glass for one small-ish city? Could it even support one small factory?
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OTOH, this idea fits really well into an interesting sci-fi world. A landscape of city-states, each with specific technologies that they use for everything. Poor economies of scale makes manufacturing manpower-intensive again. Trade in raw materials dominates between cities.
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