"The Short Position is a technique used when an investor anticipates that the value of a stock will decrease in theshort term, perhaps in the next few days or weeks. In a short sell transaction the investor borrows the shares of stock from the investment firm to sell to another investor."
But as just mentioned etrade, for instance, cannot own shares. So their I'm fact borrowed from margin accounts only. Cash accounts cannot be leaned on. And their ways of "locking" your shares so their not in face borrowed.
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