1. The Double 11 Shopping Carnival refers to the online promotion day on November 11 every year, which originated from the online promotion activities held on November 11, 2009 in Taobao Mall (Tmall). At that time, the number of merchants involved and the promotion efforts were limited, but the turnover was far beyond the expected effect, so November 11 became a fixed date for Tmall to hold large-scale promotion activities.
 2. The Double Eleven has become an annual event in China's e-commerce industry, and has gradually affected the international e-commerce industry.
 3. On October 27, 2021, the Information and Communication Administration of the Ministry of Industry and Information Technology disclosed that the Ministry had held an administrative guidance meeting to standardize the "Double 11" short message marketing behavior of e-commerce platforms, requiring e-commerce platforms not to send marketing short messages without the consent or request of consumers.
 4. On November 4, the China Consumer Association issued a reminder: "Double 11" prices may be the most expensive in the whole year, sorting out six points to draw the attention of consumers.
 5. On November 8, Xinhua Finance and Economics, together with Suning E-shop, released the "Double Ten One" Consumer Upgrade Report.