Special Considerations

Efficient market hypothesis (emh): definition and critique.

efficient market hypothesis google books

Gordon Scott has been an active investor and technical analyst or 20+ years. He is a Chartered Market Technician (CMT).

efficient market hypothesis google books

What Is the Efficient Market Hypothesis (EMH)?

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

According to the EMH, stocks always trade at their fair value on exchanges, making it impossible for investors to purchase undervalued stocks or sell stocks for inflated prices. Therefore, it should be impossible to outperform the overall market through expert stock selection or market timing , and the only way an investor can obtain higher returns is by purchasing riskier investments.

Key Takeaways

  • The efficient market hypothesis (EMH) or theory states that share prices reflect all information.
  • The EMH hypothesizes that stocks trade at their fair market value on exchanges.
  • Proponents of EMH posit that investors benefit from investing in a low-cost, passive portfolio.
  • Opponents of EMH believe that it is possible to beat the market and that stocks can deviate from their fair market values.

Investopedia / Theresa Chiechi

Understanding the Efficient Market Hypothesis (EMH)

Although it is a cornerstone of modern financial theory, the EMH is highly controversial and often disputed. Believers argue it is pointless to search for undervalued stocks or to try to predict trends in the market through either fundamental or technical analysis .

Theoretically, neither technical nor fundamental analysis can produce risk-adjusted excess returns (alpha) consistently, and only inside information can result in outsized risk-adjusted returns.

$599,090.00

The February 9, 2024 share price of the most expensive stock in the world: Berkshire Hathaway Inc. Class A (BRK.A).

While academics point to a large body of evidence in support of EMH, an equal amount of dissension also exists. For example, investors such as Warren Buffett have consistently beaten the market over long periods, which by definition is impossible according to the EMH.

Detractors of the EMH also point to events such as the 1987 stock market crash, when the Dow Jones Industrial Average (DJIA) fell by over 20% in a single day, and asset bubbles as evidence that stock prices can seriously deviate from their fair values.

The assumption that markets are efficient is a cornerstone of modern financial economics—one that has come under question in practice.

Proponents of the Efficient Market Hypothesis conclude that, because of the randomness of the market, investors could do better by investing in a low-cost, passive portfolio.

Data compiled by Morningstar Inc., in its June 2019 Active/Passive Barometer study, supports the EMH. Morningstar compared active managers’ returns in all categories against a composite made of related index funds and exchange-traded funds (ETFs) . The study found that over a 10 year period beginning June 2009, only 23% of active managers were able to outperform their passive peers. Better success rates were found in foreign equity funds and bond funds. Lower success rates were found in US large-cap funds. In general, investors have fared better by investing in low-cost index funds or ETFs.

While a percentage of active managers do outperform passive funds at some point, the challenge for investors is being able to identify which ones will do so over the long term. Less than 25 percent of the top-performing active managers can consistently outperform their passive manager counterparts over time.

What Does It Mean for Markets to Be Efficient?

Market efficiency refers to how well prices reflect all available information. The efficient markets hypothesis (EMH) argues that markets are efficient, leaving no room to make excess profits by investing since everything is already fairly and accurately priced. This implies that there is little hope of beating the market, although you can match market returns through passive index investing.

Has the Efficient Markets Hypothesis Any Validity?

The validity of the EMH has been questioned on both theoretical and empirical grounds. There are investors who have beaten the market, such as  Warren Buffett , whose investment strategy focused on  undervalued  stocks made billions and set an example for numerous followers. There are portfolio managers who have better track records than others, and there are investment houses with more renowned research analysis than others. EMH proponents, however, argue that those who outperform the market do so not out of skill but out of luck, due to the laws of probability: at any given time in a market with a large number of actors, some will outperform the mean, while others will  underperform .

Can Markets Be Inefficient?

There are certainly some markets that are less efficient than others. An inefficient market is one in which an asset's prices do not accurately reflect its true value, which may occur for several reasons. Market inefficiencies may exist due to information asymmetries, a lack of buyers and sellers (i.e. low liquidity ), high transaction costs or delays, market psychology, and human emotion, among other reasons. Inefficiencies often lead to  deadweight losses . In reality, most markets do display some level of inefficiencies, and in the extreme case, an inefficient market can be an example of a  market failure .

Accepting the EMH in its purest ( strong ) form may be difficult as it states that all information in a  market , whether public or private, is accounted for in a stock's price. However, modifications of EMH exist to reflect the degree to which it can be applied to markets:

  • Semi-strong efficiency : This form of EMH implies all public (but not non-public ) information is calculated into a stock's current share price. Neither fundamental nor  technical analysis  can be used to achieve superior gains.
  • Weak efficiency : This type of EMH claims that all past prices of a stock are reflected in today's stock price. Therefore, technical analysis cannot be used to predict and beat the market.

What Can Make a Market More Efficient?

The more participants are engaged in a market, the more efficient it will become as more people compete and bring more and different types of information to bear on the price. As markets become more active and liquid, arbitrageurs will also emerge, profiting by correcting small inefficiencies whenever they might arise and quickly restoring efficiency.

The Library of Economics and Liberty. " Efficient Capital Markets ."

Yahoo Finance. " Berkshire Hathaway Inc. (BRK-A) ."

Federal Reserve History. " Stock Market Crash of 1987 ."

Morningstar. " Active Funds vs. Passive Funds: Which Fund Types Had Increased Success Rates? "

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Finance pp 127–134 Cite as

Efficient Market Hypothesis

  • Burton G. Malkiel  

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A capital market is said to be efficient if it fully and correctly reflects all relevant information in determining security prices. Formally, the market is said to be efficient with respect to some information set, ϕ , if security prices would be unaffected by revealing that information to all participants. Moreover, efficiency with respect to an information set, ϕ , implies that it is impossible to make economic profits by trading on the basis of ϕ .

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Malkiel, B.G. (1989). Efficient Market Hypothesis. In: Eatwell, J., Milgate, M., Newman, P. (eds) Finance. The New Palgrave. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-20213-3_13

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  1. The Efficient Market Hypothesists

    Describes the lives, theories, and legacies of six great minds in finance who changed the way we look at financial markets and equilibrium. Bachelier, Samuelson, Fama, Ross, Tobin, and Shiller; proponents and critics of the market efficiency theories who redefined modern finance, creating the foundation on which all financial analysis rests.

  2. The Efficient Market Hypothesists

    You can also search for this author in PubMed Google Scholar. Part of the book series: Great Minds in Finance (GMF) ... Eugene Fama's Efficient Market Hypothesis. Front Matter. Pages 91-91. PDF The Early Years. Colin Read; Pages 93-97. ... The Efficient Market Hypothesists. Book Subtitle: Bachelier, Samuelson, Fama, Ross, Tobin and Shiller.

  3. The Efficient Market Hypothesis, the Financial Analysts Journal, and

    Fama's results reported in 1965 were entirely empirical in nature, but the coincident work by Samuelson (1965) provided a strong theoretical basis for this hypothesis. The term "efficient market hypothesis" means many things to many people; Fama in his classic paper (Fama 1970) and other financial economists who have built on his work are ...

  4. 2

    A key concept for the understanding of markets is the concept of arbitrage - the purchase and sale of the same or equivalent security in order to profit from price discrepancies. Two simple examples illustrate this concept. At a given time, 1 kg of oranges costs 0.60 euro in Naples and 0.50 USD in Miami.

  5. Efficient Markets Hypothesis

    The efficient markets hypothesis (EMH) maintains that market prices fully reflect all available information. Developed independently by Paul A. Samuelson and Eugene F. Fama in the 1960s, this idea has been applied extensively to theoretical models and empirical studies of financial securities prices, generating considerable controversy as well as fundamental insights into the price-discovery ...

  6. Efficient Markets Hypothesis

    The investment performance of common stocks in relation to their price-earnings ratios: a test of the efficient market hypothesis. Journal of Finance 32, 663-82. Article Google Scholar. Becker, G. 1976. Altruism, egoism, and genetic fitness: economics and sociobiology. Journal of Economic Literature 14, 817-26. Google Scholar.

  7. 4

    The rational expectations hypothesis, under the name of the "efficient-markets model," has been used quite extensively in financial-market research. The efficient-markets model asserts that prices of securities are freely flexible and reflect all available information. ... Save book to Google Drive. To save content items to your account ...

  8. Efficient-market hypothesis

    Efficient-market hypothesis. Stock prices quickly incorporate information from earnings announcements, making it difficult to beat the market by trading on these events. The efficient-market hypothesis ( EMH) [a] is a hypothesis in financial economics that states that asset prices reflect all available information.

  9. The Efficient Market Hypothesists

    Describes the lives, theories, and legacies of six great minds in finance who changed the way we look at financial markets and equilibrium. Bachelier, Samuelson, Fama, Ross, Tobin, and Shiller; proponents and critics of the market efficiency theories who redefined modern finance, creating the foundation on which all financial analysis rests.

  10. Efficient-Market Hypothesis

    In finance, the efficient-market hypothesis (EMH) asserts that financial markets are "informationally efficient," or that prices on traded assets (e.g., stocks, bonds, or property) already reflect all known information, and instantly change to reflect new information. Therefore, according to theory, it is impossible to consistently outperform the market by using any information that the market ...

  11. What Is the Efficient-Market Hypothesis? Overview & Criticisms

    The efficient-market hypothesis claims that stock prices contain all information, so there are no benefits to financial analysis. The theory has been proven mostly correct, although anomalies exist. Index investing, which is justified by the efficient-market hypothesis, has supported the theory. That line set off a theoretical explosion in ...

  12. [PDF] Efficient Markets Hypothesis

    The efficient markets hypothesis (EMH) maintains that market prices fully reflect all available information. Developed independently by Paul A. Samuelson and Eugene F. Fama in the 1960s, this idea has been applied extensively to theoretical models and empirical studies of financial securities prices, generating considerable controversy as well as fundamental insights into the price-discovery ...

  13. THE EFFICIENT MARKET HYPOTHESIS

    The following years witness many books written about the EMH, one of the most important is Cootner's, The Random Character of Stock Market Prices, published in 1964 (Cootner, 1964). The book is a collection of papers by Roberts, Bachelier, Cootner, Kendall, Osborne, Granger and Morgenstern, Staiger, Fama and many others (Cootner, 1964).

  14. Efficient Market Hypothesis

    9.1 Introduction. Market efficiency hypothesis is one of the most controversial theories in economics. It prescribes that markets are efficient because they reflect all the information that impact on them. Embedded in this theory is the assertion that markets are rational. Markets cannot be both irrational and efficient.

  15. What Is the Efficient Market Hypothesis?

    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 ...

  16. Efficient Market Hypothesis (EMH): Definition and Critique

    Aspirin Count Theory: A market theory that states stock prices and aspirin production are inversely related. The Aspirin count theory is a lagging indicator and actually hasn't been formally ...

  17. Efficient Market Hypothesis: Weak Form Efficiency: An examination of

    Where can we find evidence of market efficiency? With what tools can we test market efficiency?These are some of the questions that this book approaches. The Efficient Market Hypothesis (EMH) is a theory in financial economics, developed by Eugene Fama, which states that asset prices fully reflect all available information.

  18. Efficient Market Hypothesis

    A capital market is said to be efficient if it fully and correctly reflects all relevant information in determining security prices. Formally, the market is said to be efficient with respect to some information set, ϕ, if security prices would be unaffected by revealing that information to all participants. Moreover, efficiency with respect to ...

  19. Books: 'Efficient Capital Market Hypothesis'

    This book weaves together historical narrative and quantitative bibliometric data to detail the path financial economists took in order to form one of the central theories of financial economics—the influential efficient-market hypothesis—which states that the behavior of financial markets is unpredictable.