Shorting a stock meaning


So, after reading some explanations. Now, I understand what shorting a stock means.

Essentially you borrow let’s say 100 shares from XYZ and sell it to the market at a price of $10/share and pocket the money and when the price drops to $5/share you buy the stock back, return it and you get $5/share. Correct ?

Question : Does it have a time period ? Like I borrow the stock from XYZ , do they have time period of when I should return it ? Can’t they just ask me to return their share when the market is high so they gain profit not when it’s low ? Also on what site can I short a stock ? Any platform for it ?

Like when in The movie 'The Big Short'. Vinnie was rushing Mark to sell the stock otherwise they will lose ? I mean the stock that want to short has already gone down a lot why would they rush it ? Thanks in advance


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