Capacity Each person or entity must have legal capacity or authority in order to enter into an enforceable contract. Examples of persons who lack capacity are minors, those adjudged legally incompetent, and persons under the influence of mind altering drugs or alcohol. For a company to have capacity to enter into a contract, it must be duly existing and organized under the laws of a state, and the person signing on its behalf must have authorization to do so from the board of directors or management of the company. Note that the law presumes that every person or entity who enters into a contract has capacity, and the party alleging lack of capacity will be faced with the heavy burden of proving otherwise.
Offer and Acceptance Every valid and enforceable contract involves an offer followed by an acceptance. There is no contract unless the offer is accepted. Thus, if John offers to sell his collection of baseball cards to Joe for $500, and Joe's response is to offer $250 instead, Joe has not accepted John's offer. Instead, he made a counter-offer that can be accepted or rejected by John. Both the offer and the acceptance should be clear and unambiguous; once the offer has been accepted, the parties are said to have had a "meeting of the minds."
Consideration The third necessary element of a contract is consideration. Consideration is defined as something of