In an unexpected announcement, earlier this week the U.K.'s top regulator, the Financial Conduct Authority which is tasked with overseeing Libor, announced that the world's most important, and manipulated, benchmark rate will be phased out by 2021, catching countless FX, credit, derivative, and other traders by surprise because while much attention had been given to possible LIBOR alternatives across the globe (in a time when the credibility of the Libor was non-existent) this was the first time an end date had been suggested for the global benchmark, which as we explained on Thursday, had died from disuse over the past 5 years.