拍卖涉及三个民事法律主体——拍卖人、委托人和竞买人,三个民事主体行使三个民事法律行为——委托行为、拍卖行为和竞买行为。三个民事法律行为紧密联系,相互依存,缺一不可;三个民事法律行为的相互作用形成了拍卖活动的全过程,而拍卖物品或财产权利成交是三个民事法律行为作用的结果。因此,拍卖活动的起因是委托,其结果是竞买,拍卖起到委托和竞买的桥梁作用;而引起拍卖行为的是委托人对其委 The auction involved three subjects of civil law - the auctioneer, the client and the bidder, and the three civil agents exercised three civil legal acts - the commissioning act, the auctioning activity and the bidding activity. The three civil legal acts are closely interdependent and indispensable. The interaction of the three civil legal acts forms the whole process of the auction, and the auction of the goods or property rights is the result of the action of the three civil legal acts. Therefore, the auction is the cause of the commission, the result is a bid, the auction played the role of a bridge between commission and bidding; and the cause of the auction is the principal of its commission