PPP-adjusted GDP is an indicator of the level of goods/services affordable by all citizens together. The treemap shows how global total purchasing power is div

PPP-adjusted GDP is an indicator of the level of goods/services affordable by all citizens together. The treemap shows how global total purchasing power is divided between countries. A treemap of GDP PPP per capita would show the breakdown of purchasing power if you put one citizen of each country in a single room. I think a bar chart would be a better choice in that case.