The increase in the number of producers and manufacturers leads to various methods of attracting customers. One of the appropriate ways to attract customers is to provide them with post-sale support. To guarantee the quality of a product is one of the services according to which the seller is committed to change the problematic product. To analyze the legal aspects of guarantee makes it necessary to make guarantee in agreement with contracts. Analyzing guarantee according to contract and insurance ,reward is presented and it is concluded that the autonomous legal nature of it seems most probable.
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