Hamer v. Sidway is a landmark case from 1891 that established important principles regarding consideration in contract law. The case revolves around the promise made by an uncle to his nephew, offering $5,000 if the nephew refrained from drinking alcohol and smoking until he turned 21. This case is significant because it illustrates that consideration does not have to involve a tangible exchange; instead, the refraining from certain actions can constitute valid consideration, impacting the understanding of what makes a contract enforceable.
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