Assess students' ability to analyze how pricing strategies and market structure affect firm profitability in differentiated-product oligopolies. The quiz will test conceptual and quantitative understanding of strategic interactions (Bertrand vs Cournot), the role of product differentiation and number of firms, impacts of cost changes and entry barriers on equilibrium prices, outputs, and profits; require deriving/interpreting reaction functions and Nash equilibria, computing profits from given linear demand and cost parameters, and performing comparative statics for policy or collusion scenarios.