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en.wikipedia.org/wiki/Efficient-market_hypothesis

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 or changes in discount rates ...

en.wikipedia.org/wiki/Financial_market_efficiency

James Tobin identified four efficiency types that could be present in a financial market: 1. Information arbitrage efficiency. Asset prices fully reflect all of the privately available information (the least demanding requirement for efficient market, since arbitrage includes realizable, risk free ...

www.investopedia.com/exam-guide/cfa-level-1/securities-markets/weak-semistrong-strong-emh-efficient-market-hypothesis.asp

CFA Level 1 - Weak, Semi-Strong and Strong EMH. Learn the aspects of the three forms of the efficient market hypothesis. Includes assumptions and testing methods of each form.

www.investopedia.com/ask/answers/032615/what-are-differences-between-weak-strong-and-semistrong-versions-efficient-market-hypothesis.asp

Mar 26, 2015 ... The strong form version of the efficient market hypothesis states that all information – both the information available to the public and any information not publicly known – is completely accounted for in current stock prices, and there is no type of information that can give an investor an advantage on the ...

www.investopedia.com/articles/02/101502.asp

May 5, 2017 ... When you place money in the stock market, the goal is to generate a return on the capital invested. Many investors try not only to make a profitable return, but also to outperform, ... Weak efficiency - This type of EMH claims that all past prices of a stock are reflected in today's stock price. Therefore, technical ...

www.dough.com/blog/efficient-market-hypothesis

Sep 9, 2016 ... Dr. Schultz was on the “Ryan and Beef Show” to explain the efficient market hypothesis (EMH). The EMH considers how much information about a company and its stock price is readily available to investors. The less information there is, the weaker EMH is, and the more information there is, the stronger ...

www.thebalance.com/efficient-markets-hypothesis-emh-2466619

Nov 7, 2017 ... You may not have heard of the Efficient Market Hypothesis, also known as EMH, but you've probably wondered why even the most experienced mutual fund portfolio managers and other professional investors often lose to the major market indexes (or indices if you prefer), such as the S&P 500 Index.

www.morningstar.com/InvGlossary/efficient_market_hypothesis_definition_what_is.aspx

Efficient Market Hypothesis - Definition for Efficient Market Hypothesis from Morningstar - A market theory that evolved from a 1960's Ph.D. 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.

obliviousinvestor.com/efficient-market-hypothesis-strong-semi-strong-and-weak

Nov 19, 2009 ... If I were to choose one thing from the academic world of finance that I think more individual investors need to know about, it would be the efficient market hypothesis. The name “efficient market hypothesis” sounds terribly arcane. But its significance is huge for investors, and (at a basic level) it's not very hard ...