In the current proposal for the Sustainable Development Goals, Goal 10 states the aim to ‘reduce inequality within and among countries’. For many (good) reasons, much articulation of this goal has focused on its first component – reducing inequality between co-citizens within countries. But it is important also to consider what should be the appropriate target for the second component. What should be our aim and measure in reducing inequality amongst countries? My suggestion is to lessen the gap in per capita national wealth – the value of each country’s financial and physical assets. Download policy brief on these SDGs: What does it mean to reduce inequality between countries