How should we measure inequality? There are two metrics that economists use: relative and absolute. In the past I have argued that the relative metric – which is by far the dominant approach, embodied in the standard Gini index, in the famous “elephant graph”, and in logarithmic distribution graphs – is problematic in that it is aligned with the interests and perspectives of the rich, and effectively obscures real inequalities in the distribution of new income around the world. From the perspective of justice, and indeed from the perspective of the poor themselves, what really matters is the absolute gap between rich and poor, not relative rates of change.