Written by Jamie Drummond, ONE’s Co-Founder. Firstly – apologies! Open letters like this can be self-important and irritating, but they can also be a helpful way of driving a set of specific questions upon disparate gatherings – like Davos or UNGA – with the hope of focussing debate and driving towards answers. And given the development sector’s been hit by “UNGA fever” again – here goes. A few years ago, many of us, across the public, private and non-profit sectors, worked together...