In general, writers have made Marxist and feminist interpretations of the treaty. attempts to understand the purpose and nature of the treaty as a phenomenon of global understanding, in particular, the relational theory of contracts, originally developed by American experts Ian Roderick Macneil and Stewart Macaulay, which was based at least in part on the contract theory of the American scientist Lon L. Fuller, while American scientists were at the forefront of the development of the economic theories of contracts focused on transaction costs and the so-called « effective violation ». Among the factors that constitute an alleged formation of contracts are: literally: the void means having no legal value and the agreement means agreement, promise or contract made with someone. A non-responsibility agreement therefore means an agreement that has no legal value. Therefore, under Article 10 of the Act, the following conditions must be essential to the validity of a contract: on the other hand, budgetary and social policy agreements, such as those between children and parents, are generally not applicable on the basis of public policy. 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.
As a general rule, courts are not in a position to balance the « proportionality » of the consideration, provided that the consideration is determined as « sufficient », the adequacy being defined as an exercise in legal review, while « adequacy » is subjective fairness or equivalence. For example, consent to the sale of a car for a pfennig may constitute a binding contract (although the transaction is an attempt to avoid taxes, it is treated by the tax authorities as if a market price had been paid).  Parties may do so for tax purposes and attempt to conceal donations in the form of contracts. This is called the peppercorn rule, but in some legal systems, the penny may be an insufficient nominal consideration. An exception to the adequacy rule is money, a debt that must always pay in full for « compliance and satisfaction. »     JotForm proposes prefabricated contract models and contract models that facilitate the design of important documents. An agreement that is not legally necessary to make it enforceable, except for proof that the agreement has been reached and that the parties approve it. There are certain agreements that are expressly cancelled. They are written as follows: (1) Agreement by a minor or an unhealthy-minded person. [Sec.11] (2) Agreement whose consideration or purpose is unlawful [p.23)] (3) Agreement reached as a result of a bilateral factual error essential to the agreement (4) Agreement whose consideration or purpose is partially unlawful and the illegal part cannot be separated from the legal part [p.24] of the Agreement.