As finance and development ministers and legislators gather in Morocco for the annual meetings of the World Bank and the International Monetary Fund (IMF), from Oct. 9 to 15, the pressing issue of runaway global inequality will loom large on their agenda. Governments can use various tools to address inequality, including fair taxes, quality public services and just labor conditions. And an important tool they should consider now is universal social security, a set of policies and programs designed to ensure financial security across a person’s lifetime. The World Bank and IMF wield substantial influence by funding and shaping social...