The course starts by reviewing the different theories that explain the existence of firms/organisations. Given the strong empirical content of the course, we review the main econometric tools required to understand the applications and readings (Regression analysis, RCTs, Panel Methods, Difference-in-Differences, IV and Regression Discontinuity). Then, the course study a number of topics and applications that include: the role of managers and management practices, communication, social interactions and peer effects within firms, the role of incentives and imperfect information, intrinsic motivation, the hierarchical structure of the firm (horizontal vs. vertical firms, family firms), team vs. individual production. The course is taught through a series of lectures, problem sets and readings of empirical papers. The assessment of the course includes a group coursework, a group presentation and a written final exam.