The rich in the West are getting richer. Many countries have experienced a sharp concentration of incomes over the last three decades. The top 1% of Americans have doubled their share of national income (from 8 to 17%) since Ronald Reagan was inaugurated 32 years ago – see graph, source here. The elite in other advanced economies, including, Australia, the UK, Japan and Sweden, have also gotten a larger share of the pie. We have been able to understand the concentration of incomes at the national level thanks to the study of tax records by enterprising scholars such as Emmanuel Saez, Thomas Picketty and Sir Anthony Atkinson. But until recently, we didn’t know much about the global concentration of incomes (there’s no global tax collector with a similar database).