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Using evidence from leases and price series, this article examines the total factor productivity of farming in the Paris Basin between 1450 and 1789. Existing evidence about productivity is unreliable, the article argues, and the leases provide historians with a new and valuable source for the study of productivity and economic growth. The article defends the methods used with the leases, which point to spurts of noteworthy growth on local farms but also to setbacks during times of war and increased taxation. It concludes with an analysis of the causes of economic growth in preindustrial agriculture.