Reducing inequalities: how should we measure and monitor SDG Goal 10?

The inclusion of income redistribution in the UN Sustainable Development Goals, as part of SDG Goal 10 aiming to reduce inequality within and among countries, reflects an increasing realisation that addressing inequalities is intrinsically important, as well as instrumental to human development and several other development outcomes through a variety of channels. But how should we measure and monitor progress in reducing inequalities? Here we argue that looking at the sub-national level may be important.