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Capacity

In all systems of contract law, the capacity of a variety of natural or juristic persons to enter into contracts, enforce contractual obligations, or have contracts enforced against them is restricted on public policy grounds. Consequently, the validity and enforceability of a contract depends not only on whether a jurisdiction is a common, civil, or mixed law jurisdiction but also on the jurisdiction's particular policies regarding capacity. For instance, very small children may not be held to bargains they have made, on the assumption that they lack the maturity to understand what they are doing; errant employees or directors may be prevented from contracting for their company, because they have acted ultra vires (beyond their power). Another example might be people who are mentally incapacitated, either by disability or drunkenness. Specifics vary between jurisdictions, for example article 39 of the Philippine Civil Code provides a comprehensive overview of the most typical circumstances resulting in lost or diminished juridical capacity: age, mental disability, the state of being a deaf-mute, penalty, absence, insolvency, and trusteeship.

Each contractual party must be a "competent person" having legal capacity. The parties may be natural persons ("individuals") or juristic persons (" corporations "). An agreement is formed when an "offer" is accepted. The parties must have an intention to be legally bound; and to be valid, the agreement must have both proper "form" and a lawful object. In England (and in jurisdictions using English contract principles), the parties must also exchange " consideration " to create a "mutuality of obligation", as in Simpkins v Pays.

In the United States, persons under 18 are typically minor and their contracts are considered voidable; however, if the minor voids the contract and benefits received by the minor are returnable, those benefits must be returned. The minor can enforce breaches of contract by an adult while, absent ratification upon the minor's reaching adulthood, the adult's enforcement may be more limited.

Meanwhile, in Singapore, while individuals under the age of 21 are regarded as minors, sections 35 and 36 of the Civil Law Act 1909 provide that certain contracts entered into by minors aged 18 and above are to be treated as though they were adults. Additionally, the Minors' Contracts Act 1987 as applicable in Singapore and in England and Wales provides that a contract entered into by a minor is not automatically unenforceable and that a "court may, if it is just and equitable to do so, require the defendant to transfer to the plaintiff any property acquired by the defendant under the contract, or any property representing it".

In addition to age, a party to a contract may lack capacity on the grounds of mental illness or senility. Under Singapore's Mental Capacity Act 2008, for example, "a person lacks capacity in relation to a matter if at the material time the person is unable to make a decision for himself or herself in relation to the matter because of an impairment of, or a disturbance in the functioning of, the mind or brain". Where an individual lacks capacity on grounds of mental illness or senility, a relative or other responsible person may obtain a lasting power of attorney to make decisions concerning the "personal welfare" of the person lacking capacity, the "property and affairs" of the person, or both. Questions as to whether an individual has the capacity to make decisions either generally or with regard to a particular matter or class of matters are generally resolved by a judicial declaration and the court making the declaration may appoint one or more individuals to act as conservators (American English) or deputies (Commonwealth English) for the person lacking capacity.