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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 an ... the hypothesis have stated that market efficiency does not mean not having any uncertainty about the future, that market efficiency is a simplification ...

www.investopedia.com/terms/m/marketefficiency.asp

The degree to which stock prices reflect all available, relevant information. Market efficiency was developed in 1970 by Economist Eugene Fama who's theory ...

www.investopedia.com/terms/e/efficientmarkethypothesis.asp

The efficient market hypothesis (EMH) is an investment theory that states it is ... beaten the market over long periods of time, which by definition is impossible ...

www.businessdictionary.com/definition/efficient-market.html

Definition of efficient market: Market where all pertinent information is available to all participants at the same time, and where prices respond immediately to ...

financial-dictionary.thefreedictionary.com/Efficient+market

Definition of Efficient market in the Financial Dictionary - by Free online English dictionary and encyclopedia. What is Efficient market? Meaning of Efficient ...

pages.stern.nyu.edu/~adamodar/New_Home_Page/invemgmt/effdefn.htm

MARKET EFFICIENCY - DEFINITION AND TESTS. What is an efficient market? Efficient market is one where the market price is an unbiased estimate of the true  ...

www.forbes.com/sites/investopedia/2013/11/01/what-is-market-efficiency

Nov 1, 2013 ... The efficient market hypothesis suggests that stock prices fully reflect all ... occurrences, so they eventually revert back to their mean values.

www.forbes.com/sites/investopedia/2011/01/12/efficient-market-hypothesis-is-the-stock-market-efficient

Jan 12, 2011 ... The efficient market hypothesis (EMH) maintains that all stocks are perfectly ... According to the EMH, if one investor is profitable, it means the ...

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 ...