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United Kingdom
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Correlation meaning
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What does Correlation mean?
Correlation describes how two variables—typically asset prices or returns—move in relation to each other over time. In practice, lawyers use it to assess whether values tend to rise or fall together (positive correlation), move in opposite directions (negative correlation), or show no consistent relationship (near zero). It is usually evidenced statistically, often by a correlation coefficient between -1 and +1.
This is a descriptive, cross‑disciplinary concept rather than a defined legal term, and is not generally set out in UK or Irish legislation or case law. It is widely used in investment management, fund documentation (including diversification disclosures under UCITS/AIFMD), derivatives and structured products (for example, correlation risk and correlation swaps under ISDA), collateral and concentration limits, banking and regulatory risk management, and in expert evidence for valuation, securities litigation, and competition damages.
Legally significant points include: higher correlation reduces diversification benefits, may weaken hedging effectiveness, and can affect margining, risk limits and covenants. Correlation is time‑varying and context‑specific, so parties typically rely on historic data and expert analysis to support or challenge causation and loss.
Usage and meaning are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland.
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