consideration under American law

Consideration is the central concept in the common law of contracts and is required, in most cases, for a contract to be enforceable. Consideration is the price one pays for another's promise. It can take a number of forms: money, property, a promise, the doing of an act, or even refraining from doing an act. In broad terms, if one agrees to do something he was not otherwise legally obligated to do, it may be said that he has given consideration. For example, Jack agrees to sell his car to Jill for $100. Jill's payment of $100 (or her promise to do so) is the consideration for Jack's promise to give Jill the car, and Jack's promise to give Jill the car is consideration for Jill's payment of $100. Elements of consideration The Restatement (Second) of Contracts states that the elements of consideration are as follows: An example of this is renting of apartment. The landlord and tenant come together to discuss the terms of the exchange (most of the time, the leasing is outlined in a contract). Thus, they have fulfilled the first requirement of consideration. To meet the second element, there must be a mutual exchange. In this case, the landlord provides housing, while the tenant provides rent payment. Third, the bargain terms must be of value. The apartment is worth what the tenant hands over each month. Therefore, this contract has met its consideration requirement, because it fits all elements of consideration. Lack of Consideration Past consideration is not valid. Something that is already done is done, and it does not change the legal position of the promisor. Any goods or services to be exchanged must be exchanged at or after the time of contract formation. Preexisting duty does not count as consideration. An illusory promise, or one which the promisor actually has no obligation to keep, does not count as consideration. The promise must be real and unconditional. This doctrine rarely invalidates contracts; it is a fundamental doctrine in contract law that courts should try to enforce contracts whenever possible. Accordingly, courts will often read implied-in-fact or implied-in-law terms into the contract, placing duties on the promisor. For instance, if a promisor promises to give away a third of his earnings for the year and earns nothing, he has no actual obligation to do anything.