A selling strategy that's successful for one person might not work for somebody else. Think about a short-term trader who sets a stop-loss order for a decline of 3%; this is a good strategy to reduce any big losses. The stop-loss strategy can be used by longer-term traders also, such as investors with a three- to five-year investment time frame. However, the percentage decline would be much higher, such as 15%, than that used by short-term traders. On the other hand, this stop-loss strategy becomes less and less useful as the investment time frame is extended.