Precipitation and political determinism

Or, as Tyler Cowen puts it, a rainfall theory of democracy:
Why have some countries remained obstinately authoritarian despite repeated waves of democratization while others have exhibited uninterrupted democracy? This paper explores the emergence and persistence of authoritarianism and democracy. We argue that settled agriculture requires moderate levels of precipitation, and that settled agriculture eventually gave birth to the fundamental institutions that under-gird today’s stable democracies.
... and now brace yourself for the awesome use of econometrics...
An instrumental variables approach demonstrates that while low levels of rainfall cause persistent autocracy and high levels of rainfall strongly favor it as well, moderate rainfall supports stable democracy. This econometric strategy also shows that rainfall works through the institutions of the modern territorial state borne from settled agriculture, institutions that are proxied for by low levels of contemporary tribalism.

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