Reward to risk ratio for all the securities will be constant, if the market is efficient and securities are priced fairly. According to the efficient market hypothesis (EMH) or theory, share prices accurately reflect all available information. Equities, according to the EMH, trade on exchanges at their fair market value.
Investors, according to EMH proponents, benefit from investing in a low-cost, passive portfolio. EMH detractors argue that securities can deviate from fair market values and that outperformance of market is possible. In theory, neither technical nor fundamental analysis can consistently provide risk-adjusted excess returns, and inside information is only source of outsized risk-adjusted returns.
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