This document discusses consent and contracts. It states that when consent is not free due to coercion, undue influence, fraud, or misrepresentation, the contract is usually voidable by the party whose consent was affected. It defines undue influence as using a dominant position over another party to obtain an unfair advantage. A mistake of fact can be either unilateral, where one party is mistaken, or bilateral, where both parties are mistaken about an essential matter, in which case the contract is void.