By Gillian Tett

Four years ago, Zoltan Pozsar helped change how policy makers visualise the financial world when he worked with colleagues at the New York Federal Reserve to create a gigantic wall map of shadow banking. Astonishingly, it was the first time anyone had laid out these financial flows in detailed, graphic form. And by doing that, the NY Fed researchers showed why the sector mattered – and why policy makers needed to rethink how the financial ecosystem did (or did not) work.

Now Pozsar has left the NY Fed and teamed up with Paul McCulley, the former investment luminary of Pimco (and the man who coined that phrase “shadow banking”) to tackle another issue. But this time, it is not securitisation they want to “map” – but “helicopter money”, or quantitative easing.