A first basis for valuation in the theory of product liability is the violation of the warranty. There are two types of guarantees: explicit and tacit. In the implied category, three main subtypes are: the tacit guarantee of market cash (given only by traders), the tacit guarantee of adequacy to a specific purpose and the implied guarantee of ownership. There are a number of problems with the use of the guarantee theory: There must be a sale of the goods; The applicant prescribed the action; the applicant informs the seller within a reasonable time. The seller may, as part of the restrictions imposed by the Magnuson-Moss Act, limit or exclude explicit guarantees, or limit or exclude implicit guarantees. The privilege or absence between the buyer and the seller has been significantly eroded as a restriction in the guarantee theory, but a lack of privity may still affect the plaintiff`s recovery; the applicant`s risk management in the event of the use of defective goods may exclude recovery. The unspoken safeguards provided by U.S. law could extend over a longer period of time. However, most states allow written guarantees to include clauses limiting these unspoken guarantees to the same period as the written guarantee. [30] However, the mere fact of American life is that implicit guarantees are an intrinsic part of every transaction, and this is one of the reasons why American products are considered safer and more reliable than those manufactured in countries where such guarantees are not applied. And because the average buyer, who is a consumer, does not bother to read the „small print“ in most purchases, the government has defined minimum performance criteria that are defined to determine whether the parties expressly provide for it or not. A buyer may intend to use the goods for particular or unusual purposes in relation to the usual use for which the goods are sold. If this is the case, the seller implicitly guarantees that the goods are only suitable for this purpose: a guarantee is a promise that the goods sold will meet the performance standards indicated.

A contractual obligation (and the legal liability associated with it) is created when a manufacturer or seller provides a guarantee and a buyer depends on the warranty to make his purchase decision. A guarantee can be either in writing or orally. Another category is when the law imposes a warranty that requires the manufacturer to meet certain market or fitness standards. We insert them into the following scenarios. Explicit and unspoken safeguards and their exclusion or limitation can often conflict.