Hedging specifically offsets a known risk exposure, while diversification spreads capital across multiple uncorreleated assets or strategies to lower overall portfolio volatility. You are spot on about correlated pairs—holding EUR/USD and GBP/USD long simultaneously isn't true diversification; it just doubles your dollar exposure.
To measure combined exposure, professional traders calculate net position size per currency or asset class, factoring in historical correlation coefficients. In prop firm trading, managing this combined exposure is critical for respecting strict daily loss limits and drawdown caps. A sudden correlated market move can breach your max drawdown in minutes if your positions overlap.
How do you currently track your combined market exposure? Drop your methods below!