Assess students' ability to analyze how positive and negative network effects and switching costs shape pricing strategies, barriers to entry, and competitive dynamics in digital platform markets. The quiz should require application to multi-sided platforms, evaluation of tactics (subsidies, loss-leading, bundling, interoperability, lock-in, portability), and consideration of tipping, winner-take-most outcomes, and regulatory implications; include conceptual questions and short case-based quantitative reasoning on pricing trade-offs between scale-building and monetization.