Mean Return
Investopedia Commentary
Mean returns attempt to quantify the relationship between the risk of a portfolio of securities and its return. It assumes that while investors have different risk tolerances, rational investors will always seek the maximum rate of return for every level of acceptable risk. It is the mean, or expected, return that investors try to maximize at each level of risk.
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See also: Abnormal Return, Actual Return, Capital Budgeting, Expected Return, Portfolio, Risk, Systematic Risk, Unsystematic Risk