It shall be unlawful under this section:
(1) For any person engaged in commerce in this state to sell or offer to sell motor fuel at wholesale or retail, as the case may be, where the effect is to injure competition.
(2) For any person, where the effect is to injure competition, to offer a rebate, to offer to give a rebate, to offer a concession of any kind in connection with the sale of motor fuel.
(3) For any retailer to induce or attempt to induce or to procure or attempt to procure the purchase of motor fuel at a price less than cost to wholesaler. Any person who violates any provision of this section shall be subject to the provisions and penalties of this chapter.