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Suppose your cousin invests in the stock market and doubles her money in a single year...

Suppose your cousin invests in the stock market and doubles her money in a single year while the market, on average, earned a return of only about 15%. Is your cousin's performance a violation of market efficiency?

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Answer #1

No, an efficient market does not prevent investors from earning a return above the average market return. It is completely possible for investors to beat the market at times. Therefore your cousin's performance is not a violation of market efficiency. However, if this happens on a consistent basis, there would certainly be some doubt cast on the market efficiency.

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