求翻译：股指期货的理论价格可以借助基差的定义进行推导。根据定义，基差=现货价格-期货价格，也即：基差=（现货价格-期货理论价格）-（期货价格-期货理论价格）。前一部分可以称为理论基差，主要来源于持有成本（不考虑交易成本等）；后一部分可以称为价值基差，主要来源于投资者对股指期货价格的高估或低估。因此，在正常情况下，在合约到期前理论基差必然存在，而价值基差不一定存在；事实上，在市场均衡的情况下，价值基差为零。是什么意思？

The theoretical price of the stock index futures can make use of the definition of basis for derivation. By definition, basis = spot price - futures prices, namely: the basis (spot price - theoretical futures price) - (futures price - theoretical futures price). The first part can be called a theore

Shares of theoretical price index futures with poor base derived from the definition. According to the definition, the base Difference = spot prices - futures prices, and that is: the difference = (spot price theory - futures price) - (futures price - Price futures theory). The first part can be ca

The stock refers to the stock the theory price to be possible to draw support from the base difference the definition to carry on the inferential reasoning.According to definition, base difference = spot price - forward price, also namely: Base difference = (spot price - stock theory price) - (forwa

Theory of stock index futures prices can be defined with the basis of inference. By definition, basis = spot price-futures prices, namely: basis = (spot price-theory of futures prices)-(theory of futures prices-futures price). Front part is known as a theoretical basis, mainly from the carrying cost

unit refers to a theoretical price futures can be defined with the inferior base inferred. According to the definition, the base Difference = spot prices - futures prices, and that is: the difference = (spot price theory - futures price) - (futures price - Price futures theory). The first part can