Unilateral gratuitous obligations

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These obligations are undertaken voluntarily and are also known as unilateral voluntary obligations or gratuitous promises. If one person promises in definite terms to do something for benefit to another, he may be under a legal obligation to keep his promise.

Example
promise to give a sum of money to charity. This is unilateral Imposes a legal obligation on only one person (the promisor / donor) and it is gratuitous because the other party (the charity) does not to do anything in order to be entitled to the money.

Not a majoy feature of commercial dealings, but they do something arise in a business context.

Example
A promise to keep an offer open for a certain period of time A promise to renegotiate the terms of a contract

In England, gratuitous obligations are not generally regarded as being enforcement. This is because, in English law, there is a doctrine of consideration which requires that both parties must be under an obligation to give something of value, before either will be legally bound to an obligation. Gratuitous obligations will only be enforced by the courts if they are constituted by a formal deed under seal.