Paul Volcker and Alan Greenspan were the Elvis and Beatles of this movement – the first to see widespread fame for their efforts. Then came Ben Bernanke, perhaps the Jimi Hendrix or Led Zeppelin of his day, taking existing tools and pushing them in new, previously unconsidered, directions. Now, we have Janet Yellen and Mario Draghi, whose legacies are as yet undefined. They may end up like the next generation of rock stars from the 1970s – something like Bruce Springsteen, with a deep focus on common people in his music. Or, they could be the Bee Gees, who focused simply on commercial success. Only time will tell.