Did parliamentary constraints foster economic activity or was activity the cause of constraints? This article addresses the first part of this question by examining the long-term effects of belonging to the Duchy of Wurttemberg wherein the parliament placed considerable checks on the various dukes from 1495 to 1796. I use a geographic natural experiment and compare areas just inside of the Duchy with adjacent areas outside of it. Economically similar prior to 1495, areas within the Duchy had a higher degree of urbanization and commercialization in the subsequent period. I provide further evidence that this difference reflects three mechanisms: local representation in parliament, improved local public-goods provision, and attraction of upper-tail human capital.