2/Opponents of Biden's bill are criticizing it for not being purely about roads and bridges. This is silly. https://twitter.com/MarshaBlackburn/status/1379883470491680775?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1379883470491680775%7Ctwgr%5E%7Ctwcon%5Es1_&ref_url=https%3A%2F%2Fwww.bloomberg.com%2Fopinion%2Farticles%2F2021-04-09%2Fthe-meaning-of-infrastructure-is-a-pointless-debate
3/The reason the government spends money on infrastructure is a positive externality. Roads, bridges, etc. are things that the private sector won't build enough of if left to its own devices.
4/But this same rationale applies to tons of stuff!

Take research, for example. The positive externality from research is even stronger than the one from roads!
5/Cleaning up lead has huge positive externalities. Why not call that "infrastructure" too? It's the same rationale for spending.
6/But externalities aren't the only reason for government to spend money building stuff.

For example, building housing is good because it cancels out the political power of local NIMBYs who block private-sector development.
7/And a third reason to have the government do stuff is in-kind redistribution.
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