The set of self-service deposit in supermarkets is not based on the collateral obligation of contract 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。
Strict definition of collateral obligation contributes to interest protection and charge equality of both parities, assuring them of contract performance.
附随义务的界定有利于保护双方的利益，均衡双方负担，保证双方当事人实现合同的目的。
As the essential obligation in contract law system, the Collateral obligation is developed on the basis of good faith.
大陆法系的合同附随义务是建立在诚信原则基础上的一项重要制度。
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