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Offer, acceptance, and invitation to treat

In certain circumstances, an implied contract may be created. A contract is implied in fact if the circumstances imply that parties have reached an agreement even though they have not done so expressly. For example, if a patient refuses to pay after being examined by a doctor, the patient has breached a contract implied in fact. A contract which is implied in law is sometimes called a quasi-contract. Such contracts are means for courts to remedy situations in which one party would be unjustly enriched were he or she not required to compensate the other. Quantum meruit claims are an example.