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Efficient Market Hypothesis: Is the Stock Market Efficient?

https://www.investopedia.com/articles/basics/04/022004.asp
The efficient market hypothesis is growing in influence, even if it has historically fallen short in terms of explaining stock market behavior.

Fractal Markets Hypothesis (FMH): What it is, How it Works

https://www.investopedia.com/terms/f/fractal-markets-hypothesis-fmh.asp
Fractal markets hypothesis is a theory that seeks to explain sudden increases in market volatility and decreases in market liquidity.

Efficient Market Hypothesis (EMH): Definition and Critique

https://www.investopedia.com/terms/e/efficientmarkethypothesis.asp
The Efficient Market Hypothesis (EMH) is an investment theory stating that share prices reflect all information and consistent alpha generation is impossible.

Informationally Efficient Market Definition

https://www.investopedia.com/terms/i/informationallyefficientmarket.asp
An informationally efficient market is one that uses all available information in the formation of market prices.

Adaptive Market Hypothesis (AMH): Overview, Examples, Criticisms

https://www.investopedia.com/terms/a/adaptive-market-hypothesis.asp
The adaptive market hypothesis (AMH) combines principles of the widely utilized efficient market hypothesis (EMH) with behavioral finance.

Forms of Market Efficiency: Weak, Strong, and Semi-Strong

https://www.investopedia.com/ask/answers/032615/what-are-differences-between-weak-strong-and-semistrong-versions-efficient-market-hypothesis.asp
The efficient market hypothesis (EMH) theorizes that the market is generally efficient, but offers three forms of market efficiency: weak, semi-strong, and strong.

Semi-Strong Form Efficiency: Definition and Market Hypothesis

https://www.investopedia.com/terms/s/semistrongform.asp
Semi-strong form efficiency is a form of Efficient Market Hypothesis (EMH) assuming stock prices include all public information.

Fundamentals Of Fractal Markets Theory

https://www.investopedia.com/articles/investing/012115/fractal-markets-theory.asp
Fractal Market Hypothesis has emerged as an alternative to longstanding economic theories due to its ability to explain investor behavior during crises.

What Is an Inefficient Market? Definition, Effects, and Example

https://www.investopedia.com/terms/i/inefficientmarket.asp
An inefficient market, according to economic theory, is one where prices do not reflect all information available.

Financial Markets: Random, Cyclical or Both?

https://www.investopedia.com/articles/financial-theory/09/markets-cyclical-vs-random.asp
Are the markets random or cyclical? Depends on whom you ask. We look at both sides of the argument.