Assess students' ability to create a formal game-theoretic model (players, timing, strategies, payoffs) of an incumbent and potential entrant in a two-sided digital platform market. The quiz requires incorporation of cross-side network effects, multi-homing, and asymmetric information (e.g., private costs or demand types), specification of appropriate equilibrium concept (Bayesian Nash and/or subgame-perfect equilibrium), derivation of entry and pricing strategies, comparative statics, and discussion of welfare and policy implications. Provide formal equilibrium proofs and interpret economic intuition.