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Observing that the market was FREQUENTLY efficient, EMT Adherents went on to conclude incorrectly that it was ALWAYS efficient. The difference between these propositions is night and day.
Warren Buffett
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Interpretation

What this quote means

The quote highlights the misconception that just because markets can be efficient at times, they are always efficient.

Warren Buffett points out a critical misunderstanding among adherents of the Efficient Market Theory (EMT). While it is true that markets can show efficiency in their operations and pricing, it is a mistake to assume that this efficiency is constant and universally applicable. Recognizing the difference between occasional efficiency and perpetual efficiency is crucial for investors and analysts, as it affects how they approach market dynamics and investment strategies.

Themes

MarketEfficiencyInvestmentStrategyMisconception

In practice

Example use cases

This quote can be used in an investment seminar to illustrate common pitfalls in market analysis.

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Quote by Warren Buffett | QuoteProject