We start with the well-known 100% profit limit on a short-sale of stock (borrowing and selling a stock, hoping to re-buy at a lower price). When you (short) sell a stock, you receive cash but also retain the obligation to buy that stock back. The profit on a full round-trip is therefore (the sale price minus the purchase price) times the number of shares. Because the sale price is set at the beginning, the lowest purchase price is 0, so the return on the original sale is (sale price - 0)/sale price, or 100%.
Chanos posits the ability for a short seller to sell more as a stock declines. On face, this doesn't seem to increase the position as a lower price means a lower market value on which to add. However, adding (selling more) does increase the obligation to return shares. If prices rebound after an additional short sale, the seller has both additional losses and a larger liability than before. Therefore, adding to short sales is risking more.
Secondly, Chanos discusses the unlimited possibility of loss given a short sale. He says that stop-losses and other automatic price triggers can reduce losses. This is also true for long positions, however. The key difference is that with short sales, one has to constantly monitor price and decide when/if to cover if there is an adverse move. Long and un-levered positions have the unique and key ability to wait, while shorts have to watch and are dependent on liquidity. In turbulent markets, this ability to wait is unparalleled:
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Would stop-losses help in the above? Perhaps a short seller can cover at the $300 level, but it is far from certain. Separately, what if the seller shorts more after the weakness in early October? He/she would have been serious trouble against a nearly 400% rally. Short selling can be profitable and in my opinion is highly useful to the economy at large. However, the real risks of this technique are Not easily overcome.
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