The number of copies is not directly related to the validity period. Generally speaking, contracts signed on the basis of mutual consent are equally valid. The unification of dynamic behavior and static agreement of both parties to the contract includes both the whole dynamic process of contact and negotiation between the two parties before reaching an agreement, and the agreement formed after the two parties reach an agreement and determine the main terms or terms of the contract.

The former, such as invitation to offer, offer and counter-offer. Including pre-contractual obligations and liability for negligence in contracting; The latter, such as acceptance, contract formation and contract terms. The conclusion of a contract refers to the behavior of two or more parties to establish a contractual relationship through consultation.

In the process of signing the contract, no party may impose its will on the other party, and no unit or individual may illegally interfere. This principle mainly emphasizes three points:

(1) emphasizes that both parties are equal in law and consider each other's interests. It is not allowed to oppress the small with the big and the weak with the strong, and it is not allowed to bully the big with the small and eat the rich with the poor.

(2) Emphasize that when signing a contract, both parties must fully negotiate and reach an agreement on the premise that the intention is true (any contract that uses fraud or coercion to impose one's will on the other party against the other party's true intention is invalid).

(3) Emphasize the equality of rights and obligations of both parties and adhere to the basic principles of commodity exchange.

Baidu Encyclopedia-Contract Making