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 ...

I began this article with the goal of addressing an academic notion, the efficient-market hypothesis, or EMH. My research dissuaded me. In one University of Chicago article, a faculty member questions ...

Editor's note: This is the introductory article in a series discussing the merits of the efficient market hypothesis. You can read Caleb Petitt's defense of EMH in Part 2 here. Nothing in this article ...

The efficient market hypothesis (EMH) holds that a security’s price already reflects all relevant, publicly available information at any given time. The theory asserts that every trader operates on ...

In his September 2024 paper, The Less-Efficient Market Hypothesis, Cliff Asness reports that financial markets have become less efficient over the past 30 years. Asness, a former student of Eugene ...

The Efficient Market Hypothesis stated across all markets simultaneously is false, but there is a lot of nuance, and there are numerous nuanced violations worth knowing about. Whether the EMH is true ...

Editor's note: This is the Part 2 of our series discussing the merits of the efficient market hypothesis. You can read Kristian Fors' criticism of EMH in Part 1 here. Nothing in this article should be ...