Empires, indeed governments generally, tend to be good things at first and bad things the longer they last. First they improve society’s ability to flourish by providing central services and removing impediments to trade and specialisation; thus, even Genghis Khan’s Pax Mongolica lubricated Asia’s overland trade by exterminating brigands along the Silk Road, thus lowering the cost of oriental goods in European parlours. But then, as Peter Turchin argues following the lead of the medieval geographer Ibn Khaldun, governments gradually employ more and more ambitious elites who capture a greater
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