Theoretical analysis of the market with the deposition (efficient market hypothesis), or EMH, as supplemented, competitive market believe the value should be equal to the market price of the shares. Demonstrate that the changes of stock prices at the moment, one is a reflection of the continuous data supplemented. If the decisions of investors trading on the market on the basis of predictions. Reasons (rational expectations), the stock price will rise or fall rapidly when new information comes in. Therefore, no one can make a profit exceeding the normal profit margins that investors get a normal level of profit is (Normal Profit) to other words that changed. In stock prices is consistent with news, information, changes in the company's fundamentals. Call this style capital market efficiency in the market that relay the news or the market that investors use the forecasts in the variables that affect a stock price predictions.
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