(Affidavites): Before futures trading, the futures dealer requires investors to agree to a legal document that actually fulfills the contract content. It usually refers to an agreement whereby a futures broker can offset the client's margin on his or her behalf when the client's margin is insufficient. Futures trading terminology. The agreement is a Taiwanese term. It is similar to the agreement in mainland China. Generally, in order to settle something or to promise something, both parties will first sign the agreement, either with a signature or a seal.

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