In the United States, persons under the age of 18 are generally minors and their contracts are deemed cancelled; However, if the minor does not repay the contract, the minor`s benefits must be reimbursed. The minor may impose breaches by an adult, while the implementation of the adult may be limited according to the principle of good deal. [Citation required] Estoppel or unfair enrichment may be available, but it is usually not. According to Gordon v Selico , it is possible to misreprestter either by words or by behaviour. In general, opinions or intentions are not factual allegations related to misrepresentation.  If a party claims expertise on the subject in question, it is more likely that the courts will give that party`s opinion as a factual allegation.  To be a legal contract, an agreement must have the following five characteristics: trade agreements assume that the parties intend to be legally bound, unless the parties explicitly state otherwise, as in a contractual document. For example, in the Rose- Frank Co/JR Crompton-Bros Ltd case, an agreement between two commercial parties was not reached because the document stipulated an « honour clause »: « This is not a commercial or legal agreement, but only a declaration of intent by the parties. » In the case of an agreement resulting from a bilateral error in the restoration of essential facts, recovery is permissible, as the agreement is not known but is cancelled. On the other hand, national and social agreements, such as those between children and parents, are generally not applicable on the basis of public order. For example, in the English case Balfour v. Balfour, a man agreed to give 30 dollars a month to his wife while he was not home, but the court refused to enforce the agreement when the husband stopped paying. On the other hand, in Merritt/Merritt, the Tribunal imposed an agreement between an insane couple, because the circumstances suggested that their agreement should have legal consequences.
Contracts may be classified as (i) valid, (ii) invalid, iii) null and void, (iv) unlawful or (v) unenforceable. A contract for the form of the contract must contain all the essential elements. In the absence of one or more of these elements, the contract is cancelled, cancelled, illegal or unenforceable. (2) Applicability: a contract or transaction that cannot be applied is valid, but the court does not impose it. Unlivable is generally not applicable as opposed to nullo (or void ab initio) and not applicable.