Stock Market Glossary

Mean reversal

Assumption that prices return to a mean in the long term.

In brief: Assumption that prices return to a mean in the long term.

Meaning in practice

Mean reversion strategies buy what has fallen excessively and sell what has risen excessively. They work well in sideways markets and hurt in strong trends – the exact opposite of momentum.

Context for investors and traders

For traders, this term is most useful when preparing and executing an order. Its meaning depends on the venue, liquidity, time frame and order type. A single reading is not a reliable buy or sell decision.

How to use this in practice

In practice, the term should be linked to a specific trading plan: entry, exit, position size and costs belong together. In short time frames, spread, slippage and delayed execution can quickly outweigh the theoretical benefit of an observation.

What to keep in mind

Write down which observation confirms or invalidates your assumption before trading. This keeps the term a decision-making tool rather than a retrospective justification for risk already taken.

What does Mean reversal mean in simple terms?

Assumption that prices return to a mean in the long term.

When is this term relevant to investors?

Assess the term together with price, costs, position size and a predefined loss limit. That turns a market observation into a traceable framework rather than an automatic trading rule.

What should I check before acting on Mean reversal?

Write down which observation confirms or invalidates your assumption before trading. This keeps the term a decision-making tool rather than a retrospective justification for risk already taken.

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