call/put in option

只知道Option,不知道什么是In Option。Option有In The Money/Out Of Money,但没听过In Option。
 
call, is the option dictionary is to pay a premium(money) to guarantee the buy price for a stock within a time period.
So, people buying call option is expecting the underlying stock will be going up within the time period specified.

put, is the option dictionary is to pay a premium(money) to guarantee the sell price for a stock within a time period.
 
It's true. Quite a lot of risk
 
賣空是讓股票行先把其他客人已買進的股票先內部借給你,讓伱先沽。等股票價錢下跌後再買回還給股票行再還給借你的客人

另外一種是sell call or naked call.原理一樣
 
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