If the contractual terms are uncertain or incomplete, the parties do not reach an agreement in the eyes of the law.  An agreement is not a contract and the inability to agree on key issues that may include price or security elements may lead to the failure of the entire contract. However, a court will endeavour to implement commercial contracts where possible by excluding an appropriate design of the contract.  In New South Wales, even if a contract is uncertain or incomplete, the contract may remain binding on the parties if a sufficiently secure and comprehensive clause requires the parties to submit to arbitration, negotiation or mediation.  An exception arises when advertising makes a unilateral promise, such as offering a reward, as decided in the famous case of Carlill v Carbolic Smoke Ball Co, in 19th century England. The company, a pharmaceutical manufacturer, proposed a smokeball that, if it sniffed “three times a day for two weeks,” would prevent users from catching the “flu.” If the smokeball does not prevent “the flu, the company promised that it would pay $100 to the user, adding that they deposited “$1000 in the Alliance bank to show our sincerity in the file.” When Ms. Carlill complained about the money, the company argued that the complaint should not be considered a serious and legally binding offer; instead, it was a “simple mess”; However, the Court of Appeal found that Carbolic had made a serious offer to a reasonable man and found that the reward was a contractual undertaking. The nature of the communication with which the contract is entered into is irrelevant, unless the legal requirements impose enforceable conditions, it must meet the above conditions. Payment or no payment, if there is an option contract, the supplier cannot revoke the offer before the end of the deadline. If there is a binding contract between the parties and, if so, what conditions depend on what they have agreed.
In England, some contracts (insurance and partnerships) require the utmost good faith, while others may require good faith (employment contracts and agency). Most English treaties do not need good faith, provided the law is respected. However, there is a global concept of “legitimate trust.” All that is necessary for most contracts to be valid are the following two elements: from a legal point of view, none of these statements indicate or imply that a contract would be followed by the answer.