Self-determined fair shares never quite get the job done—as the world’s governments have demonstrated with their woefully inadequate, nationally determined pledges to cut their greenhouse gas emissions. More worryingly, ‘doing our fair share’ can too easily slip into ‘taking our fair share’. On first encountering the Doughnut, many businesses seem to look upon its outer ring of planetary boundaries as if it were a cake to be sliced up and handed out. And, like all kids at a birthday party, they want their fair share.