I don't understand that story.
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Shorting a stock is essentially making money from betting that the price of that stock will fall. Puck or Tommy can probably explain the actual mechanics of it better than me, but Puck was asking a colleague for stock tips and when the colleague asked why, Puck was saying that they were guaranteed to tank.
JE gave a pretty good description. Shorting is essentially betting the don't pass line in Craps.
Shorting Stocks 101: To short a stock, you have to borrow it from someone else because you do not own it. Heck you don't want to own it as you think it's going down......
You are shorting 1 share of apple as an example, no transaction costs:
You borrow 1 share of Apple stock at $550 a share. You immediately sell that share in the open mkt for $550. Your account gets credited $550 dollars. Just as you expect Apple tanks to $300 a share. You buy the 1 share back in the open market because you borrowed it from someone else. You then give that one share back to the entity you borrowed it from and pocket the difference. $550-$300 you make $250.
Of course in the real world there are transaction and margin costs but that is the gist of it.