efficient markets hypothesis

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What is the efficient market hypothesis?

The efficient market hypothesis (EMH), alternatively known as the efficient market theory, is a hypothesis that states that share prices reflect all information and consistent alpha generation is impossible.

Who invented the efficient market theory?

The efficient market hypothesis begins with Eugene Fama, a University of Chicago professor and Nobel Prize winner who is regarded as the father of modern finance. In 1970, Fama published “Efficient Capital Markets: A Review of Theory and Empirical Work,” which outlined his vision of the theory.

How do traders view efficient markets and EMH theory?

How a trader or investor views efficient markets and EMH theory will completely depend on their view as to whether an individual or fund is able to beat the stock market. This debate is centred around passive and active investing and trading.

Is there a link between EMH and the random walk hypothesis?

In doing so, traders contribute to more and more efficient market prices. In the competitive limit, market prices reflect all available information and prices can only move in response to news. Thus there is a very close link between EMH and the random walk hypothesis.

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