Yeager v. Farwell was a United States Supreme Court case that dealt with the issue of whether a contract between two parties was valid. The case involved a dispute between two parties, Yeager and Farwell, over a contract for the sale of a horse. Yeager had agreed to purchase the horse from Farwell for $100, but Farwell refused to accept the payment and instead demanded $150. Yeager refused to pay the additional amount and brought suit against Farwell. The Supreme Court held that the contract between Yeager and Farwell was valid and enforceable. The Court found that the contract was supported by consideration, meaning that both parties had given something of value in exchange for the horse. The Court also found that the contract was not voidable due to any fraud or misrepresentation on the part of either party. The Court's decision in Yeager v. Farwell established that contracts between two parties are valid and enforceable if they are supported by consideration and are not voidable due to fraud or misrepresentation. This decision has been cited in numerous subsequent cases and has become an important precedent in contract law.

In Yeager v. Farwell, the Supreme Court was asked to decide whether a contract between two parties could be enforced if it had been made under duress. The majority opinion held that the contract was void because it had been entered into under duress and therefore did not meet the requirements of mutual assent necessary for a valid agreement. Justice Field dissented from this decision, arguing that while contracts should generally not be enforced when they are made under duress, there were certain circumstances in which such agreements should still be upheld as valid. He argued that if both parties acted with good faith and without fraud or malice then even an agreement reached through coercion may still stand as legally binding on both sides. In his view, courts should look at all relevant facts before deciding whether or not to enforce a contract made under duress so as to ensure justice is served in each individual case.