Mo. Rev. Stat. § 1.050
1.050 Majority may act for all.
1.050. Majority may act for all. — Words importing joint authority to three or more persons shall be construed as authority to a majority of the persons, unless otherwise declared in the law giving the authority.
(RSMo 1939 § 655, A. 1949 S.B. 1001, A.L. 1957 p. 587) Prior revisions: 1929 § 655; 1919 § 7058; 1909 § 8057