Purchasing power parity Africa 1 Carbon dioxide 1 Carbon dioxide emissions 1 Cartograms 1 Diffusion 1 Global warming 1 Gross domestic products 1 Inflation persistence 1 International Comparison Program 1 Population statistics 1 Presidential election 1 Real exchange rates 1 Spheres 1 Spherical diffusion 1 Spherical geometries 1 Sticky prices 1 Sub-Saharan Africa 1 Topology 1 Topology preserving 1 United States 1 algorithm 1 boundary condition 1 carbon dioxide 1 cartogram 1 election 1 geometry 1 international comparison 1 low income population 1 power generation 1