They can change at any rate, or prices can stay the same for a long time. How much they move up does not forecast how far they may fall. Over the long term, stocks have appreciated by 9 percent. Any stock that goes up in price must eventually come back down. Stock prices will usually not fall if the company remains successful and other investments do not become more attractive.
Stock prices reflect the interests of investors.
The law of gravity does not apply to stock prices. Bears, Bulls, and Pigs are found in the stock market. These names refer to people and their attitudes toward stock market performance. Stock prices are set by the Securities and Exchange Commission, a regulatory agency of the U.S. government. Stock prices are set by the supply and demand for stocks.