Why Correlated Forex Positions Need Portfolio-Aware Position Sizing
Summary
The document introduces a position-sizing problem: sizing each new trade against its own risk allowance can understate total exposure when existing positions move in similar ways. It uses a long EUR/USD position followed by a long GBP/USD position as an example, explaining that both trades can concentrate exposure to the US dollar. A calculator that ignores open positions may therefore allow risk to accumulate beyond what the trader intended.
The text motivates correlation-aware sizing but does not explain a calculation method, define how correlation should be estimated, or describe how the tool adjusts lot sizes. It provides no backtest, performance figures, or practical comparison with standalone sizing. The example is illustrative, and the brief excerpt does not establish how stable the relationship between the currency pairs is across market conditions. Its main takeaway is to consider portfolio exposure when sizing an additional position.
Key ideas
- Sizing each trade independently can overlook accumulated account risk.
- Positions in currency pairs that tend to move together may create concentrated exposure.
- A new position can increase risk even when it meets its own standalone risk limit.
- The excerpt motivates portfolio-aware sizing but does not provide a calculation procedure or test results.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.