在这种情况下，交易双方经常会借助于一种可以与集中市场并存的差价合同（Contract for Difference）机制。在差价合约中，双方会商定商品的履约价格（Strike Price）和交易数量。
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重点就差价合同可以明显降低发电商行使市场力的行为给予了证明。
How the contract for difference depress the use of the market power of the electricity suppliers is emphasized.
保证金要求将取决于差价合同相关的金融商品，杠杆比例以及交易额。
The Margin requirement will depend on the underlying instrument of the CFD, level of leverage chosen and the value of position to be established.
纳税人：有些合同注明佣金或进销差价，有的则不注明。
Taxpayer: but some contract indicate the fees or net price amounts, some do not. What should we do?
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