Stock prices goes up and down due to many reasons that no one, not even the experts can forecast. The most effective way to explain is through the law of supply and demand.
Stock prices change every day as a result of market forces. By this we mean that share prices change because of supply and demand. If more people want to buy a stock (demand) than sell it (supply), then the price moves up. Conversely, if more people wanted to sell a stock than buy it, there would be greater supply than demand, and the price would fall.
The important things to grasp about this subject are the following:
1. At the most fundamental level, supply and demand in the market determines stock price.
2. Price times the number of shares outstanding (market capitalization) is the value of a company. Comparing just the share price of two companies is meaningless.
3. Theoretically, earnings are what affect investors' valuation of a company, but there are other indicators that investors use to predict stock price. Remember, it is investors' sentiments, attitudes and expectations that ultimately affect stock prices.
4. There are many theories that try to explain the way stock prices move the way they do. Unfortunately, there is no one theory that can explain everything.
Read more: www.investopedia.com
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