A:

The answer to the first part of this question is pretty straightforward: yes, stocks are able to lose all their value in the market. Now, we don't want to scare you off investing in stocks, or investing in general. However, we would be lying if we told you that stocks carry no risk (although some carry more than others).

To help you understand why a stock can lose all its value, we should review how stock price is determined. Specifically, the value of a stock is determined by the basic relationship between supply and demand. If a lot of people want a stock (demand is high), then the price will rise. If a lot of people don't want a stock (demand is low), then the price will fall. (For a deeper look into supply and demand and other economic concepts, check out the Economics Basics Tutorial.)

If a stock's demand sinks dramatically, it will lose much (if not all) of its value. The main factor determining the demand for a stock is the quality of the company itself. If the company is fundamentally strong, that is, if it is generating positive income, its stock is less likely to lose value.

So, although stocks carry some risk, it would not be accurate to say that a loss in a stock's value is completely arbitrary. There are other factors that drive supply and demand amongst companies. (If you want to learn more, take a look at the Stock Basics Tutorial.)

The effects of a stock losing all its value will be different for a long position than for a short position. Someone holding a long position (owns the stock) is of course hoping the investment will appreciate. A drop in price to zero means the investor loses his or her entire investment - that's a return of -100%.

Conversely, a complete loss in a stock's value is the best possible scenario for an investor holding a short position in the stock. Because the stock is worthless, the investor holding a short position does not have to buy back the shares and return them to the lender (usually a broker), which means the short position gains a 100% return. Bear in mind that, if you are uncertain about whether or not a stock is able to lose all its value, it is probably not advisable to engage in the advanced practice of short selling securities. Before you decide to try short selling, remember the downside risk of a short position is much greater. (You can check out our Short Selling Tutorial to explore this concept further.)

To summarize, yes, a stock can lose its entire value. However, depending on the investor's position, the drop to worthlessness can be either good or bad.

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