Premiums

(1) Manufactures may award discounts, concessions, coupons, or any other premium directly to consumers as sales promotions of their own products, if such sales promotions: (a) are not part of a scheme to give a particular retailer or wholesaler a competitive advantage over retailers and wholesalers generally; and (b) operate evenly among either retailers or wholesalers or both of them generally. (2) Any manufacturer engaging in a sales promotion as described in (1) above on the premises of a retailer or wholesaler shall either conduct the promotion through the manufacturer's own employee or place advertisements on the premises plainly stating that the promotion is conducted by the manufacturer.