Efficient market hypothesis states that all relevant information is fully and immediately reflected in a security's market price, thereby assuming that an investor will obtain an equilibrium rate of return in other words, an investor should not expect to earn an abnormal return (above the market return) through either technical analysis or fundamental. Two fundamental tenets make up the efficient market hypothesis emh first asserts that public information gets reflected in asset prices immediately information that should affect the future price of any financial instrument will be reflected in the asset’s price today.
The efficient market hypothesis (emh) essentially says that all known information about investment securities, such as stocks, is already factored into the prices of those securities.
A market theory that evolved from a 1960's phd dissertation by eugene fama, the efficient market hypothesis states that at any given time and in a liquid market, security prices fully reflect all available information. The efficient market hypothesis (emh) is an investment theory whereby share prices reflect all information and consistent alpha generation is impossible theoretically, neither technical nor fundamental analysis can produce risk-adjusted excess returns, or alpha, consistently and only inside information can result in outsized risk-adjusted returns. Let’s first define the efficient market hypothesis (emh), then address the implications for asset bubbles, and conclude with a discussion of what it really means for the capital markets to be efficient what is the efficient market hypothesis (emh) two fundamental tenets make up the efficient market hypothesis.
First, the efficient market hypothesis assumes that all investors perceive all available information in precisely the same manner the numerous methods for analyzing and valuing stocks pose some problems for the validity of the emh.
The efficient-market hypothesis (emh) is a theory in financial economics that states that asset prices fully reflect all available information a direct implication is that it is impossible to beat the market consistently on a risk-adjusted basis since market prices should only react to new information. The efficient market hypothesis is associated with the idea of a “random walk,” which is a term loosely used in the finance literature to characterize a price series where all subsequent price changes represent random departures from previous prices. The financial markets context 3 the efficient markets hypothesis (emh) the classic statements of the efficient markets hypothesis (or emh for short) are to be found in roberts (1967) and fama (1970.