it is well known from studies on the efficiency of index options that the high costs of hedging index option positions with a portfolio based on the constituent shares of the spot index may lead to market inefficiency.
參考答案:通过研究指数期权的效率，很多人发现，如果持仓以即期指数的组成指标股为投资组合的对冲指数期权，很可能因为高成本而导致市场无效率。