We study the relationship between foreign exchange trading activity at a small bank in Germany and volatility on the USD/EUR foreign exchange market around the events of 09/11/2001. We find that volatility and bid-ask spreads are by far larger at that time, but the shock is not persistent. The...

Black and official foreign exchange rates have co-existed for many years in a number of major Pacific Basin countries. In this paper, a framework is developed for examining the relationship between the two types of exchange rates in the cointegration and error correction context for both the...