Cal. Civ. Code § 1812.601
(a) “Advertisement” means any of the following:
(b) “Auction” means a sale transaction conducted by means of oral or written exchanges, which include exchanges made in person or through electronic media, between an auctioneer and the members of his or her audience, which exchanges consist of a series of invitations for offers for the purchase of goods made by the auctioneer and offers to purchase made by members of the audience and culminate in the acceptance by the auctioneer of the highest or most favorable offer made by a member of the participating audience. However, auction does not include either of the following: