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I recently read that the Polish mathematician Stanislas Ulam once challenged one of the great names in twentieth-century economics, Paul Samuelson, to "name me one proposition in all of the social sciences that is both true and non-trivial".$^1$ Samuelson's vote went to the idea of comparative advantage.

I am interested to know what other professional economists would volunteer as answers. I absolutely can't ask this question on Econ SE since it's opinion-based, neither on the subreddit r/AskEconomics for the same reason.

What are some other communities where this kind of question will be entertained?

$^1$ The Collected Scientific Papers of Paul A. Samuelson, vol. 3 (Cambridge, MA: MIT Press, 1966), p. 683

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    $\begingroup$ I don't know how many people will know of a different community. You could try a place like Quora I imagine. That is my best try. $\endgroup$
    – Kitsune Cavalry Mod
    Jan 16 at 15:11
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    $\begingroup$ There is a close cousin of Ulam's question here on Econ SE: economics.stackexchange.com/q/20992/42 $\endgroup$
    – Herr K.
    Jan 21 at 16:01

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