Accurately measuring the scope of global wealth inequality is a notoriously difficult undertaking – a fact that was brought to light last year when the International Consortium of Investigative Journalists published the Panama Papers, exposing clients of Panamanian law firm Mossack Fonseca. As the papers revealed, Mossack Fonseca, which is only the world’s fourth-largest provider of offshore financial services, boasted a client roster stacked with some of the world’s wealthiest and most politically connected individuals.