One issue where the leading Democratic and Republican presidential candidates seem to agree is the need for improved US infrastructure. And many economists think that the combination of need and cheap financing makes a big round of new investment a no brainer.But what kind of infrastructure investment? Fixing roads, improving an airport here or there, upgrading schools — that kind of thing? Or is it time for a megaproject … or two or three? The 21st century version of the Interstate Highway System or some such. Sounds exciting!

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For the next time you get asked “Who will build the roads?”