Portfolio Correlation: Why Diversification Fails When You Need It Most
Correlated positions amplify risk. Learn how to build a truly diversified CFD portfolio that survives stress events. Measure the correlations in your book.
What Is Correlation?
Correlation measures how two instruments move together. +1 means they always move in the same direction. -1 means they always move in opposite directions. 0 means no relationship. In CFD trading, many instruments are more correlated than traders realise.
Common CFD Correlations
- EUR/USD and GBP/USD: ~0.8 correlation — both driven by USD strength
- Gold (XAU/USD) and EUR/USD: ~0.4 — both anti-USD
- S&P 500 and Nasdaq: ~0.9 — both US tech-heavy indices
- Oil and CAD/JPY: ~0.5 — Canada is a major oil exporter
- All equity indices during a crash: correlation approaches 1.0
Why Diversification Fails in Crashes
During normal markets, a portfolio of EUR/USD, GBP/USD, and AUD/USD looks diversified (3 different pairs). But all three are USD-sensitive. When USD strengthens suddenly, all three drop simultaneously. Correlation goes to 1.0 during stress — exactly when you need diversification most.
Building a Non-Correlated Portfolio
- Mix asset classes: forex + indices + commodities + crypto CFDs
- Choose instruments with <0.5 correlation
- Stress-test: Check how your instruments moved during the 2008 crash, March 2020 crash, and major news events
- Keep total exposure reasonable — even non-correlated positions can all gap in the same direction during a black swan
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Disclaimer: CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 70-80% of retail investor accounts lose money when trading CFDs. Backtesting does not guarantee future results. Always consider whether you can afford the potential loss of your capital.