Quote from traderich:
A co-worker and I had a heated debate over this very question.
He feels that shorting a stock is much riskier because you could actually lose much more than your initial investment and the most you could gain was limited to the stock going to zero.
I told him that shorting was no riskier other than the fact that 'in general' most stocks 'tend' to move higher in price over time.
Other than that, I told him that even if I shorted GOOG for example at 100, and hit my head snowboarding and was in a coma since that time that my broker would have issued a margin call on the short position and would have subsequently sold off to maintain 50% margin in my account.
He then said that brokers don't do that, and I said of course they do, and if they don't then you are not obligated to the short position beyond your initial investment.
And, I told him that even with GOOG going up like that, that did not make the short any riskier in general. I only lose in the short position because I kept it open and did not cover, just the same as if I had been long on the stock and it dropped and didn't sell it.
I think it is interesting how most people view shorting as so much riskier than being long.
Granted, I do think that the reason they call it 'short' ing is because most folks don't leave the short position open for a long time whereas longs are meant to hold for a long time.
Also, you do have to pay margin interest to short the borrowed stocks and must pay any dividends that come due as well.
I did short the the airlines in 03 and did well with that, but the only recent short I had was RIMM at 74 and DHB at 11.44.