What it is — Currency Correlation
Currency correlation measures how closely two pairs move together, usually on a scale from minus one to plus one. Plus one means they move in lockstep; minus one means they mirror each other; near zero means they are largely independent. EURUSD and GBPUSD often correlate strongly because both quote the US dollar on one side and both economies trade with each other.
Why it matters — Currency Correlation
Correlation decides whether two open trades are two ideas or one idea wearing two hats. Long EURUSD and long GBPUSD is usually a double bet on dollar weakness, not diversification. When both turn against you at once, the combined loss can be far larger than either position suggested. This is the hidden leverage many beginners only discover in a drawdown.
One worked example
You risk 1% on EURUSD long and 1% on GBPUSD long. In your head that is 2% total risk. If the two pairs correlate around +0.85 on your timeframe, a dollar-strength move can hit both stops nearly together — the realistic worst case behaves much closer to a single 2% bet with extra spread costs. The honest accounting is to size the pair of trades as one position.
Where it misleads
Correlation is not a constant. It shifts with regimes, timeframes and news. A monthly correlation table will not save you on a five-minute chart during a central bank surprise. And zero historical correlation does not promise independence tomorrow.
Frequently asked questions — Currency Correlation
What correlation level is dangerous?
Above roughly 0.7 in the same direction, most risk models treat the positions as one bet.
Can I use negative correlation as a hedge?
Sometimes, but hedged positions still pay spread and swap on both legs, and the relationship can flip.
Related terms — Currency Correlation
Related tools — Currency Correlation
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