ECO3900H and ECO3901H explore the factors influencing firms' behaviour, market outcomes, and welfare within oligopoly industries. These courses emphasize the integration of economic models, data analysis, and skillful identification strategies to address empirical questions in economics. The first half focuses on models and empirical applications concerning firms' productivity, consumer demand, price and quantity competition, collusion, advertising, and market entry. In the second half, topics include industry dynamics such as investment, innovation, product design, vertical contracts, networks, and mergers.