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The efficient-market hypothesis (EMH) [a] is a hypothesis in financial economics that states that asset prices 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.
Eugene Francis "Gene" Fama (/ ˈ f ɑː m ə /; born February 14, 1939) is an American economist, best known for his empirical work on portfolio theory, asset pricing, and the efficient-market hypothesis. He is currently Robert R. McCormick Distinguished Service Professor of Finance at the University of Chicago Booth School of Business.
Efficient market theory, or hypothesis, holds that a security's price reflects all relevant and known information about that asset. One upshot of this theory is that, on a risk-adjusted basis, you ...
Another theory related to the efficient market hypothesis created by Louis Bachelier is the "random walk" theory, which states that prices in the financial markets evolve randomly. Therefore, identifying trends or patterns of price changes in a market can't be used to predict the future value of financial instruments.
In 1981 Shiller published an article in which he challenged the efficient-market hypothesis, which was the dominant view in the economics profession at the time. [16] Shiller argued that in a rational stock market, investors would base stock prices on the expected receipt of future dividends, discounted to a present value. He examined the ...
The efficient market hypothesis posits that stock prices are a function of information and rational expectations, and that newly revealed information about a company's prospects is almost immediately reflected in the current stock price. This would imply that all publicly known information about a company, which obviously includes its price ...
The Grossman-Stiglitz Paradox is a paradox introduced by Sanford J. Grossman and Joseph Stiglitz in a joint publication in American Economic Review in 1980 [1] that argues perfectly informationally efficient markets are an impossibility since, if prices perfectly reflected available information, there is no profit to gathering information, in which case there would be little reason to trade ...
Pages in category "Efficient-market hypothesis" The following 9 pages are in this category, out of 9 total. This list may not reflect recent changes. ...