I put the randomized-trials-for-policy thing on facebook earlier today. I love that idea. It is one of those obvious-to-me ideas that I once I had it, I couldn't believe that we weren't doing it routinely. As if people weren't thinking or something. You want to know whether something works? Try it and find out.
I had a similar feeling when I found out about homosexuality in ancient greece. When I was a kid: Many cultures are weird about homosexuality? Oh, it must be a new thing. What? It has been a well-known, standard minority fraction of human sexuality for thousands of years?
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I think using randomized trials to search for successful policies is more likely to happen in China than in the United States. Large chunks of Chinese policy are not up for discussion, let alone experimentation, but their authoritarian leaders are mostly engineers and can just mandate policy.