Political fragmentation, rural-to-urban migration and urban growth patterns in western Eurasia, 800-1800

Prominent scholars argue that Europe's political fragmentation improved the security of property rights, thereby promoting growth. We explore a complementary mechanism: urban fragmentation the proliferation of self-governing cities helped emancipate labor, and freer labor promoted both faster and more correlated town growth. To test these hypotheses, we first show that polities with more self-governing cities offered more protection to runaway serfs against lordly recapture. We then show that more fragmented areas exhibited both faster and more correlated urban growth. While both the property rights and labor freedom mechanisms predict faster growth, only the latter predicts more highly correlated growth.