I suspect a hidden driver of innovation in the modern economy is that the only time it makes sense to do home DIY/maker stuff is if you're trying to invent something actually new that has the potential to generate big returns. Repair/maintenance economics simply doesn't work.
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Comparative advantage does matter. But most people can not monetize their marginal hours. Maintenance and repair is one way, a lot of people enjoy it, and folks like an excuse to wield a power tool.
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