When "3 Trades" Is Actually Just 1 Big Bet
You open three trades: Buy EUR/USD, Buy GBP/USD, Buy AUD/USD. You feel diversified — three different pairs, three different trades. Smart, right?
Wrong. All three are bets against the US dollar. If the dollar strengthens, all three lose simultaneously. Your "three trades" are actually one big position with triple the risk.
This is correlation risk — the hidden danger that most beginners never see coming.
What Is Currency Correlation?
Correlation measures how two currency pairs move in relation to each other, on a scale from −1 to +1:
| Correlation | Meaning | Example |
|---|---|---|
| +1.0 | Move in perfect sync | Like twins walking together |
| +0.7 to +0.9 | Strong positive — mostly same direction | EUR/USD & GBP/USD |
| 0 | No relationship — independent | EUR/USD & USD/JPY (sometimes) |
| −0.7 to −0.9 | Strong negative — mostly opposite | EUR/USD & USD/CHF |
| −1.0 | Move in perfect opposition | Like a seesaw |
Common Forex Correlations
- EUR/USD ↔ GBP/USD: Strong positive (+0.85) — they usually move together
- EUR/USD ↔ USD/CHF: Strong negative (−0.95) — when one goes up, the other usually goes down
- AUD/USD ↔ NZD/USD: Strong positive (+0.90) — both tied to commodity economies
- USD/CAD ↔ Oil: Strong negative — when oil rises, CAD strengthens (USD/CAD drops)
The Correlation Trap
❌ False Diversification
Buy EUR/USD + Buy GBP/USD + Buy AUD/USD = 3× USD short. If USD strengthens, all 3 lose. You're not diversified — you're tripling your exposure.
✅ Actual Diversification
Buy EUR/USD + Sell USD/JPY + Buy AUD/NZD = 3 different stories. Different drivers, different correlations. Real diversification.
How to Check Before Trading
- Identify the common currency. If all your pairs share USD, you're making the same bet.
- Check correlation. Use free tools like MyFXBook or BabyPips correlation calculator.
- If correlation > +0.70: Treat them as ONE trade for risk purposes. Don't risk 2% on each — risk 2% total across both.
- If correlation is near 0: They're truly independent — normal risk rules apply.
Quick Recap
- ✅ Correlation measures how pairs move together (−1 to +1)
- ✅ Highly correlated pairs = same bet, multiplied risk
- ✅ Check common currency before opening multiple trades
- ✅ If correlation > 0.70, reduce combined position size
- ✅ For real diversification, trade uncorrelated pairs