Английский язык для юристов. Предпринимательское право - стр. 19
Some mutual mistakes are universally accepted as grounds for rescission. Others can give rise to lawsuits but not in all courts or in all jurisdictions. Among them are:
1. Mistakes as to Description. When both parties are mistaken in the identification and description of subject matter, a mutual mistake exists, and rescission will be granted.
2. Mistakes as to Existence. Proof that the subject matter had been destroyed before agreement was made also gives grounds for rescission. The agreement would be voidable if it were proved that just before acceptance the subject matter had been destroyed.
3. Mistakes as to Value. When two parties agree on the value of the subject matter and later find that they were both mistaken, a mutual mistake of opinion, not of fact, has occurred. Mutual mistakes of opinion are not grounds for rescinding a contract.
4. Mistakes Through Failure to Read a Document. Failure to read a document or the negligent reading of a document does not excuse performance on the ground of a mistaken understanding of the document's contents.
5. Mistakes of Law. Misunderstandings of existing laws do not give grounds for rescission; in other words, ignorance of the law is no excuse. Rescission may be allowed, however, when mistakes have related to the law of another jurisdiction.
Duress and undue influence rob a person of the ability to make an independent, well-reasoned decision to enter a contractual relationship freely. Duress may be viewed as an action by one party that forces another party to do what need not otherwise be done. Duress forces a person into a contract through the use of physical, emotional, or economic threats. In contrast, undue influence involves only the use of excessive pressure, and also requires the existence of a confidential relationship. Undue influence should not be confused with persuasion or a subtle form of inducement.
Either violence or the threat of violence against an individual or that person's family, household, or property is physical duress. Emotional duress arises from acts or threats that would create emotional distress in the one on whom they are inflicted.
A threat of a business nature that forces another party without real consent to enter a commercial agreement is called economic duress, or business compulsion. The court will rule the contract voidable on grounds of economic duress if the plaintiff can prove the existence of three elements:
1. The complaining party must first show that the other party was responsible for placing the complainant in a precarious economic situation and that the other party acted wrongfully in doing so.