Where a contract provides an exclusive method by which its consideration is to be ascertained, which method is on its face impossible of execution, the entire contract is void.
S.D. Codified Laws § 53-6-9
Impossibility of ascertaining consideration, effect
Source: CivC 1877, § 913; CL 1887, § 3537; RCivC 1903, § 1231; RC 1919, § 846; SDC 1939, § 10.0505.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.