Being relatively new to FX trading, I'm hoping someone can answer this - when building historical FX data for testing, what was commonly traded before the introduction of the Euro? I assume the Deutshemark, but was the DEM traded as actively on the crosses as the Euro is now?
In other words, is it fair to backtest the DEM/CHF, GBP, JPY, CAD, AUD, and NZD crosses as a predecessor of the Euro?