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15. If markets are efficient, what should be the correlation coefficient between stock returns for two non-overlapping time periods? (3 points)
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THE EFFICIENT MARKET HYPOTHESIS:

  1. The correlation coefficient between stock returns for two non-overlapping periods should be zero. If not, one could use returns from one period to predict returns in later periods and make abnormal profits.
  2. Expected rates of return differ because of differential risk premiums.
  3. No. Any company (Ex:Microsoft’s) continuing profitability does not imply that stock market investors who purchased Microsoft shares after its success was already evident would have earned an exceptionally high return on their investments.
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