When Two Trades Are Secretly the Same Trade — Cambodia
Instruments that move together turn two positions into one larger position without anybody deciding to double the risk. The matrix below is computed from daily closes on the platform feed; for a beginner it answers one question — is this really a second idea, or the same idea twice?
Open Exness Account →Two positions in instruments that move together are, in risk terms, one position of double the size. Beginners meet this by accident: two setups appear at the same time, both are taken, both are sized to the plan's risk figure, and the account is now risking twice what the plan allows on what turns out to be a single market view. The simplest defence in a first month is the one already in the plan — trade one instrument.
Why correlation matters for position sizing
Two open positions in strongly correlated instruments behave like one position at double the size — the account is exposed to a single move twice. In this sample the most correlated pair was EUR/JPY and GBP/JPY at +0.93, and the most inverse was EUR/USD and USD/CHF at -0.90. A trader long both halves of a +0.9 pair holds one trade, not two.
Correlation of daily returns (last ~60 sessions)
| EURUSD | GBPUSD | USDJPY | AUDUSD | USDCAD | USDCHF | NZDUSD | EURGBP | EURJPY | GBPJPY | AUDJPY | XAUUSD | XAGUSD | USOIL | UKOIL | US500 | US30 | USTEC | DE30 | JP225 | UK100 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EURUSD | 1.00 | +0.83 | -0.51 | +0.61 | -0.69 | -0.90 | +0.76 | +0.04 | -0.03 | -0.04 | -0.13 | +0.58 | +0.55 | -0.16 | +0.02 | +0.23 | +0.13 | +0.27 | +0.15 | +0.26 | -0.08 |
| GBPUSD | +0.83 | 1.00 | -0.42 | +0.57 | -0.54 | -0.76 | +0.79 | -0.53 | -0.01 | +0.18 | -0.05 | +0.44 | +0.41 | -0.14 | -0.08 | +0.22 | +0.09 | +0.21 | +0.11 | +0.19 | -0.09 |
| USDJPY | -0.51 | -0.42 | 1.00 | -0.47 | +0.39 | +0.57 | -0.46 | -0.03 | +0.87 | +0.82 | +0.78 | -0.31 | -0.27 | +0.12 | -0.02 | -0.36 | -0.37 | -0.26 | -0.24 | -0.13 | -0.00 |
| AUDUSD | +0.61 | +0.57 | -0.47 | 1.00 | -0.47 | -0.62 | +0.71 | -0.09 | -0.20 | -0.15 | +0.19 | +0.51 | +0.51 | -0.32 | -0.01 | +0.51 | +0.43 | +0.53 | +0.36 | +0.51 | +0.05 |
| USDCAD | -0.69 | -0.54 | +0.39 | -0.47 | 1.00 | +0.66 | -0.59 | -0.08 | +0.06 | +0.09 | +0.11 | -0.52 | -0.44 | -0.12 | -0.03 | -0.03 | +0.03 | -0.07 | +0.02 | -0.09 | +0.08 |
| USDCHF | -0.90 | -0.76 | +0.57 | -0.62 | +0.66 | 1.00 | -0.75 | -0.02 | +0.14 | +0.14 | +0.18 | -0.63 | -0.59 | +0.21 | -0.02 | -0.27 | -0.21 | -0.28 | -0.19 | -0.26 | +0.06 |
| NZDUSD | +0.76 | +0.79 | -0.46 | +0.71 | -0.59 | -0.75 | 1.00 | -0.25 | -0.10 | -0.00 | +0.00 | +0.47 | +0.46 | -0.16 | -0.03 | +0.29 | +0.16 | +0.33 | +0.19 | +0.31 | -0.03 |
| EURGBP | +0.04 | -0.53 | -0.03 | -0.09 | -0.08 | -0.02 | -0.25 | 1.00 | -0.01 | -0.37 | -0.10 | +0.08 | +0.10 | +0.02 | +0.17 | -0.04 | +0.04 | +0.05 | +0.03 | +0.07 | +0.03 |
| EURJPY | -0.03 | -0.01 | +0.87 | -0.20 | +0.06 | +0.14 | -0.10 | -0.01 | 1.00 | +0.93 | +0.83 | -0.03 | -0.00 | +0.06 | -0.01 | -0.28 | -0.36 | -0.15 | -0.20 | -0.00 | -0.05 |
| GBPJPY | -0.04 | +0.18 | +0.82 | -0.15 | +0.09 | +0.14 | -0.00 | -0.37 | +0.93 | 1.00 | +0.80 | -0.06 | -0.04 | +0.05 | -0.07 | -0.25 | -0.34 | -0.15 | -0.20 | -0.03 | -0.06 |
| AUDJPY | -0.13 | -0.05 | +0.78 | +0.19 | +0.11 | +0.18 | +0.00 | -0.10 | +0.83 | +0.80 | 1.00 | +0.02 | +0.07 | -0.10 | -0.04 | -0.03 | -0.10 | +0.10 | -0.01 | +0.23 | +0.04 |
| XAUUSD | +0.58 | +0.44 | -0.31 | +0.51 | -0.52 | -0.63 | +0.47 | +0.08 | -0.03 | -0.06 | +0.02 | 1.00 | +0.92 | -0.22 | -0.03 | +0.21 | +0.29 | +0.19 | +0.31 | +0.35 | -0.09 |
| XAGUSD | +0.55 | +0.41 | -0.27 | +0.51 | -0.44 | -0.59 | +0.46 | +0.10 | -0.00 | -0.04 | +0.07 | +0.92 | 1.00 | -0.24 | -0.01 | +0.37 | +0.34 | +0.38 | +0.45 | +0.52 | -0.08 |
| USOIL | -0.16 | -0.14 | +0.12 | -0.32 | -0.12 | +0.21 | -0.16 | +0.02 | +0.06 | +0.05 | -0.10 | -0.22 | -0.24 | 1.00 | +0.08 | -0.51 | -0.54 | -0.39 | -0.46 | -0.29 | -0.05 |
| UKOIL | +0.02 | -0.08 | -0.02 | -0.01 | -0.03 | -0.02 | -0.03 | +0.17 | -0.01 | -0.07 | -0.04 | -0.03 | -0.01 | +0.08 | 1.00 | -0.05 | +0.01 | -0.06 | +0.03 | -0.02 | -0.03 |
| US500 | +0.23 | +0.22 | -0.36 | +0.51 | -0.03 | -0.27 | +0.29 | -0.04 | -0.28 | -0.25 | -0.03 | +0.21 | +0.37 | -0.51 | -0.05 | 1.00 | +0.83 | +0.89 | +0.61 | +0.72 | -0.04 |
| US30 | +0.13 | +0.09 | -0.37 | +0.43 | +0.03 | -0.21 | +0.16 | +0.04 | -0.36 | -0.34 | -0.10 | +0.29 | +0.34 | -0.54 | +0.01 | +0.83 | 1.00 | +0.55 | +0.72 | +0.41 | +0.06 |
| USTEC | +0.27 | +0.21 | -0.26 | +0.53 | -0.07 | -0.28 | +0.33 | +0.05 | -0.15 | -0.15 | +0.10 | +0.19 | +0.38 | -0.39 | -0.06 | +0.89 | +0.55 | 1.00 | +0.45 | +0.89 | -0.07 |
| DE30 | +0.15 | +0.11 | -0.24 | +0.36 | +0.02 | -0.19 | +0.19 | +0.03 | -0.20 | -0.20 | -0.01 | +0.31 | +0.45 | -0.46 | +0.03 | +0.61 | +0.72 | +0.45 | 1.00 | +0.43 | +0.04 |
| JP225 | +0.26 | +0.19 | -0.13 | +0.51 | -0.09 | -0.26 | +0.31 | +0.07 | -0.00 | -0.03 | +0.23 | +0.35 | +0.52 | -0.29 | -0.02 | +0.72 | +0.41 | +0.89 | +0.43 | 1.00 | -0.06 |
| UK100 | -0.08 | -0.09 | -0.00 | +0.05 | +0.08 | +0.06 | -0.03 | +0.03 | -0.05 | -0.06 | +0.04 | -0.09 | -0.08 | -0.05 | -0.03 | -0.04 | +0.06 | -0.07 | +0.04 | -0.06 | 1.00 |
+1.00 = the instruments moved together every session; −1.00 = they moved opposite; near 0 = independent. Green = positive, red = negative; deeper colour = stronger link.
Read it with care
- 60 daily closes is a short window — treat values as indicative, not fixed.
- Correlations shift with the macro backdrop and can flip in stressed markets.
- Crypto instruments trade a 7-day week and are omitted — their daily series does not align bar-for-bar with 5-day markets.
- Correlation says nothing about direction — only about moving together.
Measured in-terminal on Exness’s own MetaTrader 5 pricing feed and symbol specifications, refreshed on a schedule. All figures are indicative and change with market conditions.
Open Exness Account →How the accident happens
The two trades look independent because the tickers are different. Nothing on the order ticket points out that the underlying driver is shared, so the risk arithmetic that was done per trade silently fails at the account level.
It is worse when a plan is going badly, because the temptation to take a second correlated entry as confirmation is strongest exactly when the first one is under water.
What to do about it before it matters
In a first month: one instrument, one open position. This makes the whole question theoretical and removes an entire class of oversized losses.
Later, when a plan runs more than one market, check the relationship before entering and treat strongly related positions as a single risk unit — half the size each, not full size twice.
Where this sits in a four-week practice run
For four weeks the answer is simply one instrument and one open position, which makes this page theoretical. That is the intended state: a first log should measure one plan on one market.
It stops being theoretical the moment a second instrument is added, which is usually well after the first run has finished. At that point the rule changes from one position to one risk allowance shared between related positions.
The journal is what makes the difference visible. Two losses on the same day, in instruments that looked unrelated, is the entry that sends a trader back to this page.