What is a Supervening Frustration of Purpose?

This is when circumstances arise that fundamentally frustrate a party's reason or purpose for entering a contract. The doctrine is similar to impracticability, but it does not relate to a party's hardship; rather it focuses on her expectation and purpose in entering the agreement. For a frustrating circumstance to relieve or excuse an obligation under a contract, the party cannot have assumed the risk of the circumstance (in the contract) or be at fault for the occurrence or the non-occurrence of the event or circumstance. Further, the occurrence or non-occurrence must have been a basic assumption on which the contract was made.

• Example: John signs up for piano playing lessons from Tara. John suffers a horrible accident that causes him to lose dexterity in his hands. This is a frustration of purpose that was unforeseeable and substantially frustrates the purpose of learning to play the piano. As such, John will be excused from performance of the contract. Suffering an economic loss is not a frustration of purpose.

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