That women earn less than men in rich countries is so well-known it is often met with a shrug. The gender wage gap is one of ten indicators in our annual “glass-ceiling index”, ranking how women fare in the workplace. On most measures, including representation on boards and in parliaments, countries improve each year. But across the oecd, a club of mostly rich countries, the median gap is stuck at 11.4%, up from a low of 11.1% in 2020 (see chart) despite policies designed to narrow it.