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Buy a put: means you borrow the stock and sell it at first, later when stock price decline, you bought it back and return the stock也就是融券
Short a call: gives other the right to buy a stock at a lower price, but the price will not be lower than current stock price, otherwise the dealer is just giving free money LOL.

第二个我也不太会,还没看到,哈哈

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上一主题:CFA Level I, derivatives这本书的 P192, transactions costs
下一主题:请教level 1 有关derivative的一道问题