On August 19, 2025, the Trade Competition Commission of Thailand (TCCT) released its draft Guidelines on the Consideration of Unfair Trade Practices and Conduct Constituting Monopoly, Reducing Competition, or Restricting Competition in Multi-Sided Platform Businesses in the Category of Digital Platforms for the Sale of Goods or Services (E-commerce). A public comment period on the guidelines is open until September 18. The draft provides the first detailed framework for how the TCCT will interpret and enforce the substantive provisions under the Trade Competition Act against digital platforms, which have a unique network effect and require complex competition analysis. This development will profoundly impact the operations of e-commerce platforms, sellers, and associated service providers in Thailand. The guidelines primarily target e-commerce digital platform business operators, which are defined as follows: E-commerce digital platform: A medium facilitating the sale, purchase, or exchange of goods or services, including any operations to create transactions or interactions between business operators via an electronic transaction system, regardless of whether service fees are charged. E-commerce digital platform business operator: A service provider of a digital platform for the sale of goods or services who acts as an intermediary facilitating the sale of goods or services, including any operations to create transactions or interactions through an electronic transaction system by receiving orders for goods or services transacted via an electronic system, whether in the form of an e-marketplace, a social marketplace, or any other form that connects purchase orders for goods or services with business operators through an electronic system. Prohibited Conduct The guidelines classify potentially anticompetitive conduct and unfair trade practices into two categories: price-related and non-price-related conduct. 1. Price-related conduct The TCCT is targeting pricing strategies that can harm competition. Key prohibited behaviors include: Price below cost: Setting prices below the average total cost without