The set of self-service deposit in supermarkets is not based on the collateral obligationofcontract of sale, but the contract between consumers and supermarkets.
自助寄存柜的设置对于超市而言不是基于买卖合同的附随义务，而是与消费者之间的一种合同。
3
Where one party to a contract fails to perform the obligationofcontract for services or its performance fails to satisfy the terms of the contract, the party shall …