China has had very active markets for both the sale and the rental of land since Song times (960–1279), if not longer. By the sixteenth century, most of the institutional arrangements that would characterize these markets until 1949 were in place. These institutions differed sharply from those of emerging land markets in early modern Western Europe: in particular, government played a lesser role in adjudicating disputes over land contracts, and customary arrangements included features that (a) gave some sellers of land claims on purchasers that could last for many years and (b) gave some tenants, especially in South and East China, very strong usufruct rights, which themselves became a form of tradable property. However, despite these and other differences from Western models, Chinese land markets were quite efficient, and provided the incentives needed for a very productive agriculture; secure tenants, for instance, responded to their strong position by behaving like owners and investing heavily in improving the land.