Lack of consideration refers to the absence of something of value exchanged between parties in a contract, which is essential for the formation of a legally binding agreement. When consideration is missing, it can render a contract unenforceable, as both parties must typically provide something tangible or intangible that benefits the other. This concept is crucial in understanding the enforceability of implied contracts and the application of promissory estoppel, as it raises questions about the legitimacy of agreements that may rely on promises without reciprocal value.
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