What is the difference between stock index and futures index?

stock market index和期指之间的区别是什么？
股指和期指的关系，根本上都受制于国内经济环境和政策趋势。股指futures市场是股票现货市场发展的产物，股指期货合约是以股票指数作为自己的标的物的。

股指又称“股票指数”，是股票价格指数的简称，是由证券交易所或金融服务机构编制的表明股票行市变动的一种供参考的指示数字。
由于股票价格波动较大，投资者会面临市场价格风险。为了应对这种情况和需要，一些金融服务机构就编制出股票价格指数，公开发布，作为市场价格变动的指标。投资者据此就可以检验自己投资的效果，并用以预测股票市场的动向。
期指就是期货指数，股指期货是期货指数较常见的一种，具有以下几个特点：
1、股指期货标的物为相应的股票指数。
2、股指期货报价单位以指数点计，合约的价值以一定的合约乘数与股票指数报价的乘积来表示。
3、股指期货的交割采用现金交割，即不是通过交割股票而是通过结算差价用现金来结清头寸。
从长期看，期指不会影响A股的涨跌趋势，也就是说A股上涨依然有其自身规律，但是期指在某些时点上一定会加大A股的波动，特别是在A股短期涨跌过程中，期指会起到助涨助跌作用。
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