Why You Should Stop Using This Common Investing Tool Immediately

Years ago, market makers were the people who stood on the floor of the New York Stock Exchange. Their job was to "make a market" for any investor who wanted to buy or sell one of the stocks they were responsible for. When prices were falling, market makers were buying; when prices rose, they would sell shares from their inventory.

While market makers were beneficial to investors (there was always someone available to take the other side of your trade), they were also expensive. Since market makers were obligated to buy and sell under any circumstances, exchange rules allowed them to charge $0.125 per share, or more, on every trade to make up for the high amount of risk they undertook.

But the main job of a market maker was to ensure that every trade was executed whenever possible -- including stop-loss orders. Usually, investors enter stop-loss orders to ensure their shares are sold when prices start to fall.

Stop-loss orders are designed to lock-in losses during fast-moving declines, but they do not guarantee the loss will be limited. In fast-moving markets, prices often show large gaps and it is possible the stop-loss order will be filled at a price well below the level it was entered.

Price declines often seem to end after the last stop-loss order is executed. For a time it was believed that market makers were trying to hit the stop-loss orders to create losses for individuals and profits for themselves. But as I mentioned earlier, market makers were trying to hit the stop-loss orders because their job was to execute as many orders as possible.

Today, market makers have largely been replaced by high-frequency trading (HFT) firms. While technology has replaced people on the exchange floor, the stop-loss order is still a magnet for prices.

Despite the drawbacks, most individual investors would never consider foregoing the comfort of stop-loss orders. Many individuals simply don't have the option of following the markets in real-time so they can sell when prices crash.

Recent crashes actually show the danger of stop-loss orders. In the past few years, rapid declines have often been followed by at least partial recoveries. Not only can stop-loss orders be a factor in accelerating declines, but they can take away an investor's opportunity to benefit from a rapid recovery.

Rather than using a standard stop-loss order, consider using a "stop-limit" order. With a limit order you are setting the worst price you will accept. For example, a stop-loss at $25 will be executed at any price below $25. If there is a quick move, you could get filled at $24 or lower. With a "stop-limit $25" order, you will be filled at $25 or above after the price falls to $25.

There is no guarantee a limit order will be filled, but it would have helped in the market crashes that have occurred in recent years.

Mental stops can also be a way to avoid taking losses in a short sell-off. With a mental stop, you check the markets after the close and sell the next day if the price is below your stop level. Mental stops can use daily or weekly closing prices. Sell orders can be entered at the market price for the next morning or a limit order can be used to try for a slightly better price when selling.

It is important to sell before losses grow too large, but traditional stop-loss orders could be a costly way to do that. Stop-limit orders or mental stops could save you a great deal of money on most trades.

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