GBPUSD, AUDUSD, NZDUSD, EURUSD). The factors affecting XXX will affect both XXXYYY and XXXZZZ. This causes positive currency correlation between XXXYYY and XXXZZZ. On the spot market, according to the 2010 Triennial Survey, the most heavily traded bilateral currency pairs were: EURUSD: 28% USDJPY: 14% GBPUSD (also called cable ): 9%