Originally posted by: JeffreyLebowski
I still don't understand how selling for less than they got it for makes money.
Short "selling" is hard to understand.
Basically, a broker has a number of shares available that they are able to loan out. This varies on a number of factors.
When somebody "shorts" a stock, they are essentially taking out an IOU on a stock with hopes of that stock dropping in value. They receive the current market value of that stock in their margin account and then start gaining more and more value as the price of that stock goes down.
The more it goes down, the less they have to repay for the borrowed shares.
Conversely, if the price of that stock goes up, they start loosing money because they now have to pay a premium for what they are borrowing.
With a short stock position, you can only make as much money as the difference between the current stock price and $0. If it is trading at $50 a share, the most they can make is $50 a share(if it drops to $0).
On the flip side, risk is infinite. If they borrow against it at $50 a share, and it rockest to $200 a share, they have to cough up the additional $150 a share. Assuming they don't close out their position earlier.
You aren't guaranteed a short sale position if the broker doesn't have any shares to lend, plus you are typically paying a hefty margin interest fee on that margin balance.