Final answer:
A unilateral mistake regarding expectations or the law traditionally does not make a contract voidable unless it's a significant mistake that defeats the purpose of the contract or was induced by the other party's fraud. Remedying such a mistake usually requires mutual consent for modification or reform of the contract terms.
Step-by-step explanation:
In the context of contract law, a unilateral mistake can have implications on the enforceability of the agreement. Generally, a unilateral mistake is a misunderstanding by one party about a basic assumption on which a contract is based. The effects of a unilateral mistake on a contract depend on various factors, including the nature of the mistake and the jurisdiction's legal standards.
If the unilateral mistake is regarding expectations or the law, it traditionally does not make the contract voidable unless the mistake is so significant that it defeats the purpose of the agreement or if it was induced by the other party's misrepresentation. Most legal systems require that a mistake, to affect the legal standing of a contract, must be substantial and pertain to the facts of the agreement, not just the individual's expectations or understanding of the law.
However, if both parties are aware of the unilateral mistake and agree to rectify it, the contract can be reformed to reflect the correct terms they initially intended to contract upon. Situations that involve both parties' consent to rectify can potentially lead to the contract being amended or fully rewritten.