This course aims at providing a synthetic but rigorous introduction to the main concepts of two interdisciplinary approaches that have been assuming a growing relevance in the analysis of governance themes: Public choice theory and law & economics. For that purpose, the language used will be adapted to students with different academic backgrounds and will gather concepts from political science, economics and law in order to foster a multidisciplinary and integrated perspective on governance issues and on the operation of democratic regimes in a global setting.