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Tag Archives: 贴水
股指期货贴水的再理解
股指期货的贴水,在全球的金融市场里面,并不多见,我提出来全球主要的股指期货,按照周五收盘价,贴水超过0.5%的就这么些。 贴水一直是国内金融市场一个奇怪又能解释的异象。 说他奇怪是因为,贴水本质上就是对指数的超越,比如现在中证500指数期货,贴水率9%以上,也就是说,如果有人管理一个中证500指数增强基金,他只要把持仓都卖掉,然后换成股指期货,里面就有9%以上的年华增强。如果卖掉的钱,再买点货币基金啥的,增强的收益可以达到11%以上。 中证500期货15年上市,贴水已经持续了6年。当然贴水程度有高有低,问题是,为什么会持续贴水。比较常见的一个解释是,中国的股票市场alpha因此很强,比如明泓幻方之类,通过交易,他们的增强收益可以25%以上,他们不想要beta风险,因此愿意付出10%以上的成本对底仓进行套保。 上面这个话题不陌生,但之前一直模模糊糊没彻底搞明白的是,当我发行一个挂钩指数的场外期权,我的交易工具是期货,我应该怎么定价。 比较具有迷惑性的点在于,是否直接用期货的价格定价,比如期货现在价格比指数便宜50个指数点,那么用期货的价格做期初价,行权价还是指数的价格,最简单的想法是这个,这样直接就把贴水放到了定价公式里面。但这里问题就来了,由于交易期货是保证金交易,这个时候r还是不是货币市场的利率。 理解这个里面就需要思维上进行一点小转化了。