SDCL § 59-8-1: Authority from seller.

An auctioneer in the absence of special authorization or usage to the contrary, has authority from the seller, only as follows:

(1) To sell by public auction to the highest bidder;

(2) To sell for cash only, except such articles as are usually sold on credit at auction;

(3) To warrant in like manner with other agents to sell, the title, quality, and quantity of personal property;

(4) To prescribe reasonable rules and terms of sale;

(5) To deliver the thing sold, upon payment of the price;

(6) To collect the price; and

(7) To do whatever else is necessary, or proper and usual, in the ordinary course of business, for effecting these purposes.