With all the regulatory upheaval in the recent past, present, and near future, the last thing the markets need is another fundamental change in the rules of the game, but that’s exactly what we have in the projected retirement of some (but not all) of the various interbank offered rates (IBORs) by the end of 2021. While not a change in the regulations per se, this change may actually have more impact on the markets than any single revision of the rules. George Bollenbacher examines the implications.