每个期货市场都有自己的合约规范，其中详细说明了市场参数，如，符号，价格变动单位等。

Each futures market has its own contract specifications, which detail the market parameters, such as the symbol, and the tick size.

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衍生产品合约可私下达成，其市场缺乏规范，且没有公开交易信息的中心场所。

Derivatives transactions are struck privately and the market is unregulated, with no central exchange where trades are disclosed.

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