A contract can be discharged by complete performance or material nonperformance of the contractual duty. Note, in passing, that the modern trend at common law (and explicit under the Uniform Commercial Code [UCC], Section 1-203) is that the parties have a good-faith duty to perform to each other. There is in every contract “an implied covenant of good faith” (honesty in fact in the transaction) that the parties will deal fairly, keep their promises, and not frustrate the other party’s reasonable expectations of what was given and what received.
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Discharge by Performance (or Nonperformance) of the Duty