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Platform Governance and Information Disclosure in Markets with Add-Ons

Author

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  • She, Huixin

Abstract

Digital platforms display sellers' prices and collect ad valorem commissions. We study how these roles shape sellers' disclosure choices and a platform's incentives to regulate them. Sellers offer a base good and an avoidable add-on, which some consumers overlook when choosing sellers. Because commissions apply to the base good but not off-platform add-ons, add-on profit is passed through more than one-for-one into lower base-good prices, creating a competition multiplier. Hidden add-on prices can reduce efficiency while raising consumer surplus through this mechanism. A platform regulates disclosure to protect commission revenue, while mandatory transparency can improve efficiency but reduce consumer surplus.

Suggested Citation

  • She, Huixin, 2026. "Platform Governance and Information Disclosure in Markets with Add-Ons," TSE Working Papers 26-1778, Toulouse School of Economics (TSE).
    • Handle: RePEc:tse:wpaper:132263
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    Keywords

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    JEL classification:

    • D11 - Microeconomics - - Household Behavior - - - Consumer Economics: Theory
    • D21 - Microeconomics - - Production and Organizations - - - Firm Behavior: Theory
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • L12 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Monopoly; Monopolization Strategies
    • L15 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Information and Product Quality
    • L81 - Industrial Organization - - Industry Studies: Services - - - Retail and Wholesale Trade; e-Commerce

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