The course aims to address some fundamental issues of public law from the perspective of economic analysis of law. Indeed, rational choice and game theories can usefully explain not only the typical market trends, which have long been the target of economic analysis of private law, but they can also explain strategic conducts by citizens, political and institutional actors in the public sphere. Moreover, thanks to the many applications and examples of positive law, the course intends to analyze the foundations of this approach and to outline the contribution that it can provide for a deeper understanding of some of the main issues of modern constitutionalism and for the functioning of public agencies.