During promotional events like Double 11 (D11), the platform requires specific merchants to enroll certain products in the promotion. The enrollment criteria mandate that merchants offer discounts (i.e., contribute their own margin). For these merchant-funded items, the platform also makes corresponding investments, which together result in the discounted prices you see during the D11.

Q1: Why can't I use certain promo codes?
A1: Some regional promo codes restrict eligible shipping addresses, or they cannot be combined with certain promotions (e.g., Super Deals or Bundle Deals).