Bai, Ying; Kung, James Kai-sing - In: The Review of Economics and Statistics 93 (2011) 3, pp. 970-981
Employing droughts and floods to proxy for changes in precipitation, this paper shows nomadic incursions into settled Han Chinese regions over a period of more than two thousand years—the most enduring clash of civilizations in history—to be positively correlated with less rainfall and...