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Concept
Illusory promise
Résumé
In contract law, an illusory promise is one that courts will not enforce. This is in contrast with a contract, which is a promise that courts will enforce. A promise may be illusory for a number of reasons. In common law countries this usually results from failure or lack of consideration (see also consideration under English law).
Illusory promises are so named because they merely hold the illusion of contract. For example, a promise of the form, "I will give you ten dollars if I feel like it," is purely illusory and will not be enforced as a contract.
It is a general principle of contract law that courts should err on the side of enforcing contracts. Parties entering into the arrangement presumably had the intention of forming an enforceable contract, and so courts generally attempt to follow this intention.
A promise conditioned upon an event within the promisor's control is not illusory if the promisor also "impliedly promises to make reasonable effort to bring the event about or to use good faith and honest judgment in determining whether or not it has in fact occurred."
Methods of finding potentially illusory contracts enforceable include:
Implied-in-law "good faith" terms
Implied-in-fact terms
Bargaining for a chance
Many contracts include "satisfaction clauses", in which a promisor can refuse to pay if he isn't subjectively satisfied with the promisee's performance. Strictly speaking, this is an illusory promise, since the promisor has no actual legal burden to pay if he chooses not to. However, courts will generally imply in law that the promisor must act in good faith and reject the deal only if he is genuinely dissatisfied. As another example, if a contract promises a promisee a certain percentage of the proceeds of a promisor's business activities, this is illusory, since the promisor doesn't have to do anything: any percentage of zero is zero. However, courts may find that the promisor made an implied promise to use reasonable efforts to try to make money, and cite him for breach of contract if he does absolutely nothing.
Source officielle
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