然而股指期货合约的交割对沪深300现货指数市场是否产生影响，沪深300指数是否也存在日历效应？这些问题影响着股票市场的稳定和投资者的收益。
However , it is uncertain that weather the calendar effects exist in the Shanghai and Shenzhen 300 index or weather the delivery of stock index futures impacts the spot market .
股指期货交割