Efficient MarketProponents of the efficient market theory believe that there is perfect information in the stock market. This means that whatever information is available about a stock to one investor is available to all investors (except, of course, insiders, but insider trading is illegal). Since everyone has the same information about a stock, the price of a stock should reflect the knowledge and expectations of all investors. The bottom line is that you should not be able to "beat the market" since there is no way for you to know something about a stock that isn't already reflected in the stock's price.
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