Using a novel and comprehensive dataset, we provide the first systematic study of liquidity in the foreign exchange (FX) market. Contrary to common perceptions, we find significant variation in liquidity across exchange rates, substantial costs due to FX illiquidity, and strong commonality in...

This supplemental appendix extends the results in Mancini, Ranaldo, and Wrampelmeyer (2011), presenting additional analyses and robustness checks. It also describes the cleaning procedure of the EBS data, compares EBS to other datasets, and discusses the robust estimation of the price impact model