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Currencies don't move alone
Most currency pairs move in groups. EUR/USD and GBP/USD typically rise and fall together against the dollar. AUD/USD and NZD/USD tend to track each other. USD/CHF and USD/JPY behave like cousins. Understanding these correlations helps you avoid hidden over-exposure and reveals what's really driving the market.
What "correlation" means
Correlation ranges from -1 to +1:
- +1.0: perfectly positive — they always move the same direction.
- 0: no relationship.
- -1.0: perfectly negative — when one rises, the other falls.
A correlation above +0.7 or below -0.7 is considered strong.
Common groupings
### Dollar-driven group
EUR/USD, GBP/USD, AUD/USD, NZD/USD usually rise when the dollar weakens broadly. Correlations among them often run 0.6–0.9.
### Inverse to USD/CHF and USD/JPY
When EUR/USD rises, USD/CHF tends to fall — both express a weak dollar. Correlation often -0.7 to -0.9.
### Commodity currencies
AUD, NZD, CAD, NOK, ZAR move with commodity cycles. AUD with iron ore and coal; CAD with oil; NOK with North Sea crude.
### Risk-on / risk-off
When risk appetite is strong, AUD and EM currencies rise; when fear hits, JPY and CHF gain.
Why this matters
- Don't double up risk. Holding long EUR/USD *and* long GBP/USD is mostly the same trade.
- Hedge smarter. A short USD/CHF position partly offsets a long EUR/USD.
- Understand surprises. When the usual correlations break, something important is changing.
When correlations break
- Country-specific shocks: Brexit broke GBP from EUR for years.
- Central-bank divergence: when Fed and ECB diverge, EUR/USD detaches from GBP/USD.
- Commodity shocks: oil spikes can decouple CAD from AUD.
A breakdown often signals a regime change worth paying attention to.
How to check correlations
Free tools display rolling correlations across pairs. Most professional terminals build them in. For non-traders, a quick visual check — overlay EUR/USD and GBP/USD on the same chart — reveals the relationship instantly.
Practical lessons for non-traders
- If you're transferring money in multiple non-USD currencies, you're likely already diversified.
- If your exposure is across pairs that all correlate to the dollar, you're concentrated, not diversified.
- For long-term savings, a basket of correlated currencies offers little protection against dollar moves.
Key takeaways
- Currency pairs cluster into groups based on common drivers.
- Strong correlations mean less true diversification.
- Correlation breakdowns often signal regime changes.
- Even non-traders benefit from understanding which currencies move together.