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Why can I make a profit when I buy a put option and the market value at maturity is lower than the strike price?
Put option is also called put option, seller option, put option, put option or elimination option. Put option means that the buyer of the option has the right to "sell" a certain number of the subject matter at the execution price within the validity period of the option contract, but does not undertake the obligation of selling.

After you buy a put option, you can sell the subject matter at the strike price in the future.

Now suppose it is a stock, and the strike price is 60.

When the market price falls in 40 yuan, you can buy shares in 40 yuan/share. After buying, you can sell the option to the seller (the person who sold you the option) at the strike price in 60 yuan. Then your income is 60-40=20 yuan.

You don't have to say more when you get to 80, do you?