For a contract to be valid, it must contain four key elements: agreement, capacity, consideration and intent. In the similar case of denunciations of agreements or good deals, a general rule is that these are not contractual offers, but only an „invitation to process“ (or negotiation), but the applicability of this rule is controversial and has various exceptions.  The High Court of Australia has stated that the notion of a unilateral contract is „unsymersive and misleading.“  (The constitution of a contract in the strict sense of the term, instead of simply reaching an agreement, requires the presence of the other 3 elements listed above: (1) consideration, (2) with the intention of creating a legally binding contract and (3) Contractual capacity) Agreements are generally established in such a way that the company that manages the online auction site presents only sellers of potential buyers. For an agreement or contract to take place, there must be two components: an offer and an acceptance. The party selling or providing the service makes an offer that the other party accepts when it receives the goods or services. In court, it was decided that advertising screens and other advertisements are an invitation to treatment and not a valid offer. Only when the customer fulfills an order or purchases the item does the terms of the offer apply. When a minor enters into a contract, the parents are not parties and cannot be held liable if the minor does not meet the conditions of the contract. But if one or both parents sign a contract with the minor, the contract is valid and they are bound by the conditions….