This postcard article by Winnie Byanyima features in the World Social Science Report on Inequality (2016). It highlights the fact that rising extreme inequalities are a global immediately pressing concern, that must be addressed without delay. She suggests that access to good quality data is imperative, to produce more in-depth research on the drivers of extreme wealth and income inequality, and their impact on poverty. She also highlights that inequality is not inevitable - there is a power dynamic to address, and civil society must hold decision-makers to account.