The efficient market hypothesis is based on the notion that prices for securities or assets in a market are always reflective of all information available to investors. The efficient market ...

Buffett rejects the efficient markets hypothesis, but still recommends low-cost index funds for most ordinary investors.

As many examples as there are of return dynamics that ostensibly shouldn't exist if the efficient market hypothesis is true, taking advantage of these as an average investor is another story.

Weak form market efficiency is a concept that suggests past stock prices and trading volumes do not predict future stock prices. In a weak form efficient market, all historical information is already ...

This is antithetical to the efficient market hypothesis, which assumes all stocks are accurately valued at all times (more on this below). Investors and institutions often use fundamental analysis ...

Merton, Robert C. "On the Current State of the Stock Market Rationality Hypothesis." In Macroeconomics and Finance: Essays in Honor of Franco Modigliani, edited by R. Dornbusch, S. Fischer, and J.