Assess students' ability to apply game-theoretic models to derive and analyze pricing equilibria in differentiated-product oligopolies. Scope includes static and dynamic price competition (Bertrand with horizontal/vertical differentiation, Hotelling), use of demand systems (logit, CES), best-response functions and Nash equilibrium existence/uniqueness, potential mixed strategies, and tacit collusion/price leadership. Tasks require deriving first-order conditions, solving for equilibrium prices, conducting comparative statics, and interpreting effects on profits and welfare; algebraic and graphical analysis with calculus-based reasoning is expected.