Mo. Rev. Stat. § 416.615
1. It is unlawful for any person engaged in commerce within this state to sell or offer to sell motor fuel below cost as defined in subdivision (2) of section 416.605, if:
(L. 1993 S.B. 374, A.L. 1995 H.B. 414)
(1996) Amendment to section by CCS/SS/SCS/HS/HB 414, Eighty-Eighth General Assembly, First Regular Session, which deleted the words "or effect" after the word "intent" in subdivisions (1) and (2) of subsection 1, subsection 2, and subsection 3, held unconstitutional as violating the single subject requirement of article III, section 23. Missouri Petroleum Marketers Association, et al. v. State of Missouri, et al. and Voss Oil, Inc., Case No. CV195-989CC (Cole County Circuit Court, 11/20/96), appeal dismissed, No. 79535 (Supreme Court of Missouri, 6/19/97).
(2004) Concept of injury is confined to action of lowering posted prices to injure a competitor by forcing it to sell product below cost, thus forcing the competitor to operate business at a loss. State ex rel. Nixon v. Quiktrip Corp., 133 S.W.3d 33 (Mo.banc).