What causes poverty? Rachana Shanbhogue interviews this year’s winners of the Nobel prize for economics—Esther Duflo, Abhijit Banerjee and Michael Kremer. Their pioneering work has changed the understanding of one of the hardest problems in economics: why do some countries grow rich while others stay poor? Plus, Europe’s Nordic banks are embroiled in money-laundering scandals. What do regulators need to do to restore confidence?