

In finance when you open a short position or equivalently go short in a security, this means you sell while you do not own the security and will profit if the price of the security goes down. Once the price is down you buy the shares you sold for a lower price. If however the shares do not go down but go up, you can theoretically loose an unlimited amount of money. Going short is contrasted with going long.
We only trade in shares and not in options and other derivatives so when we go short we open a new position and sell shares we do not own.
Before you actually send it to the Stock Exchange your broker will verify whether you have sufficient funds, if the stock value is within a regular range of the current market price and finally provide you with a total overview of your order and the related costs.
Example:
Shares Company X trade at 100 USD
You believe they are overvalued and expect the price to come down.
You go SHORT and sell 100 shares @ 100 USD
Therefore you will receive 100 x 100 = 1,000 USD
If the price drops to 80 USD you buy back the 100 shares @ 80 USD: 80 x 100 = 800 USD and you earn 200 USD
Equivalently you loose 200 USD if the shares go up to 120 USD
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