Dealers can carry out preferential sales promotion under certain special circumstances, but the preferential price shall not be lower than 85% of the pricing of copyright pages. Special circumstances include group purchase, online bookstore or membership sales, as well as national book fairs, ordering and exhibition activities and local or professional book ordering and exhibition activities filed by the press and publication bureaus of provinces, autonomous regions and municipalities directly under the Central Government, as well as during national legal holidays and major activities organized by the press and publication administrative departments.