 If the amount demanded by the injured party is excessive, they are unjustly enriched, and the breaching party has no obligation to pay the excess.Any clause in a contract which makes a provision by which unjust enrichment may occur may be unenforceable at law - that is to say that if the amount is excessive, the injured party will be unable to enforce the charge in court.Any clause which explicitly provides for unjust enrichment is considered unlawful at common law.