EFFICIENT MARKET HYPOTHESIS - EMH

Investment theory indicating the impossibility to beat the market since stock market efficiency causes prevailing share prices to always integrate and display all relevant information. Based on the theory, stocks always trade at its fair value on exchanges, which makes it impossible for investors to either buy undervalued shares or sell shares for inflated prices. So it is impossible to surpass the overall market via expert stock selection or market timing. And the only way to possibly attain higher returns is by buying riskier investments.