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Why would we need a “stop-limit order” for selling?
An important thing that many people fail to realize is that the number of shares outstanding in a stock, times the current market price of those shares, does not represent anything related to the total value of those shares.  If a company has one million shares outstanding and its total value is $10 million, then the real worth of each share is $10.  If few people feels like buying or selling, but a few people think the company is worth $50 million and offer $50/share, that could raise the market price to $50/share, but it wouldn't mean that the company became worth five times as much; it would merely mean the stock was overpriced. If, after the price went to $50/share, all the owners of the stock put in stop-loss orders at $45.  Note that the real $10/share "real value" of their stock would never have changed.  If the people who thought the stock was worth $50 decided to get out of the market, and nobody else was willing to offer more than $10, that would instantly drop the price to $10.  The fact that a million shares of stock have stop-loss orders at $45 wouldn't magically generate buyers for those stocks at that price.  Indeed, unchecked stop-loss orders would have the reverse effect, since many people who would have been willing if not eager to buy the stock if it had been available for less than $10/share would instead be trying to sell it below that price. It's too bad people think that the number of shares outstanding times the current market price represents some kind of "meaningful quantity".  If the present cash value of all future payouts associated with a share of stock is $10, then someone who buys a share of stock for less than that makes money off the seller; someone who pays more loses money to the seller.  Many people think they can lose money to the seller and still come out okay if the price goes higher, but what that really means is that they're hoping to find a bigger sucker--a game where it's guaranteed that some people will have losses they don't recoup.