This document discusses the growing wealth of rentiers (those who derive income from property or investments rather than wages) worldwide and its implications. It presents data showing that between 1987 and 2014, the share of wealth owned by rentiers relative to GDP increased from 0.5 to 1.3 globally. Over the same period, the income share of the top 1% of the population also increased substantially. The growth of rentiers' wealth concentration has increased systemic financial risks and constrained monetary policy options for central banks.