Short selling is an investment or trading strategy based on speculation, and it involves selling a security or stock that a trader does not own. A trader believes the stock or security price would decline in the future, thus borrows from a broker or dealer, and sells that stock on the open market, hoping to buy it back at cheaper prices in the future.

Short-Selling using Derivatives

1. Futures: The trader may enter a short position in a futures contract if they believe the asset price will fall.
2. Forwards: Forwards are the same as the futures, does would also need to take the same position. The only defining feature of forwards against futures is that futures are traded over Over-the-Counter (OTC), and their contract sizes are not standardized.
3. Options: The trader can take a short position on a put option on the trader’s underlying asset that they speculate will go down in value and hedge their portfolio against downside losses.

What are the Advantages and Disadvantages of Short Selling?

Advantages:

1. Potential for Huge Profits: The main advantage of short selling is the possibility of huge profits that can be made with correct speculation on any particular stock or security.
2. Creation of liquidity in the Market: Short sellers provide liquidity for buyers within the stock market, which helps the stock market function efficiently.
3. Hedging of Long Positions: As mentioned previously, short selling can hedge long positions and offset some of the risks of investing.

Disadvantages:

1. Potential for Unlimited Losses: One of the significant disadvantages of the strategy of short selling is the unlimited downward risk the trader faces. If the forecasted movement is incorrect, and the stock price goes up instead of down, the trader would have to cover the additional amount above what they had shorted the stock. Theoretically, the stock price can rise to infinite. Thus, the amount of loss is also unlimited.
2. Gives rise to the need to spread False Information: Some short sellers can spread false information in the market to drive down the share price of a particular company they have taken a short position on to drive up their profit when they buy back the stock.
3. Betting against the market: The stock market tends to go up over time (not considering any unpredictable shocks or crisis that may occur), so this strategy faces a position that it will be tough to make a profit in the long run.
4. Short squeeze: A stock may experience a short squeeze, where the stock’s price rises rapidly, which would force short sellers to buy those shares at high prices to close their position, which in turn pushes the stock price even higher.

Summary