The semi-strong hypothesis encompasses the weak hypothesis that is true concerning the alternative efficient market hypothesis.
According to the efficient-market theory, asset prices accurately represent all available information in the field of financial economics. Since market prices should only respond to fresh information, an obvious conclusion is that it is impossible to "beat the market" consistently on a risk-adjusted basis.
If an investor learns negative information about a company, they may sell their shares, which lowers the stock price. Due to the fact that buyers and sellers often have access to the same information, the efficient market hypothesis postulates a direct correlation between news (or information) and prices.
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