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Efficient Market Hypothesis (EMH) - Three forms of market

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There are 3 versions of the efficient market hypothesis: the weak form EMH, the semi-strong form EMH, and the strong-form EMH. Describe each form. Also, which form do you believe exists today? How about 30 years ago? Explain.

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This posting explains in approx. 300 words the three forms of efficient markets and discuss their existence now and 30 years ago.

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The efficient market hypothesis (EMH) states that a market is efficient if security prices immediately and fully reflect all available relevant information. If the market fully reflects information, the knowledge of that information would not allow an investor to profit from the information because stock prices already incorporate the information.
There are three forms of EMH:
1. The weak form of the EMH: Its asserts that stock prices ...

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