Not the Gunfight at the OK ChicagoThe Big Five panel at last week's Boca Raton conference turned out to be a more civilised and sober session than many delegates expected. With Eurex ceo Rudi Ferscha wedged between CBoT's Bernie Dan and CME's Craig Donohue, one could be forgiven for expecting the sparks to fly. And some certainly did, as Ferscha highlighted the drop in fees at CBoT since the arrival of Eurex US and Donohue countering with the suggestion that Eurex and its fellow European exchange Euronext Liffe (coincidentally launching its Eurodollar contract that very day) were rather more expensive than they led people to believe. Dan, for his part, took every opportunity to use his two favourite words, "integrity and transparency". To such an extent, in fact, that the panel chairman, JP Morgan's Richard Berliand, dared him not to use the word "transparency" in his next answer. He nearly...