Entries tagged with Market Efficiency
Jul 13, 2016

The efficient markets hypothesis (EMH), developed by Eugene Fama in the 1960s, simply states that prices reflect all available information. Despite its simplicity, the EMH has been difficult to test and generated decades of debate. In this video, Gene and Richard Thaler, a founding father of behavioral economics, discuss whether markets are efficient. Despite some areas of discord, Thaler sums up an important point of agreement: “Stock markets, good or bad, are the best thing we got going. So, nobody’s devised a way of allocating resources that’s better.”

(View the video)

Feb 13, 2012

EFF: I spoke with EconTalk host Russ Roberts about how the efficient market hypothesis relates to macroeconomic events of the past few years, with some additional thoughts on behavioral finance and the evolving nature of financial academic research.

Jan 9, 2012
We often hear the claim that some markets are less efficient than others—small company stocks, emerging markets, foreign exchange, and so on. Is there any evidence to support this assertion?
Jun 17, 2009

Although it would be great if we could all hire above average active managers, that only happens in Lake Wobegon. Superior managers may exist, but most investors might as well be picking their managers at random. I describe the challenge of differentiating luck from skill, and explain how intense competition among investors makes the problem even more difficult.

Jun 9, 2009

KRF: I explain why active investing is always a negative sum game. We often hear that now is a good time (or a bad time) for active investing. That does not make sense. In aggregate, active investors always underperform by their fees and expenses.

Jun 9, 2009

KRF: What does it mean to say there is a flight to quality? For every seller there must be a buyer. After exploring this simple point, I explain how expectations about future cashflows and future returns affect the current price.

Eugene F. Fama
The Robert R. McCormick Distinguished Service Professor of Finance at the University of Chicago Booth School of Business
Kenneth R. French
The Roth Family Distinguished Professor of Finance at the Tuck School of Business at Dartmouth College
This information is distributed for educational purposes and should not be considered investment advice or an offer of any security for sale. This article contains the opinions of the author but not necessarily Dimensional Fund Advisors and does not represent a recommendation of any particular security, strategy or investment product. Dimensional Fund Advisors is an investment advisor registered with the Securities and Exchange Commission. Information contained herein has been obtained from sources believed to be reliable, but is not guaranteed. Past performance is not indicative of future results and no representation is made that the stated results will be replicated.

Eugene Fama and Ken French are members of the Board of Directors of the general partner of, and provide consulting services to Dimensional Fund Advisors LP.