Power to contract denied person without understanding--Liabilities for necessaries

A person entirely without understanding has no power to make a contract of any kind, but he is liable for the reasonable value of things furnished to him necessary for his support or the support of his family. Source: CivC 1877, § 20; CL 1887, § 2519; RCivC 1903, § 20; RC 1919, § 86; SDC 1939, § 30.0801; SDCL, § 27A-2-1.