This is a bad "map". The pie charts add clutter to the image, and it's not immediatly obvious how two cities compare. The country borders offer no additional information other than vague context for those who know what countries are located where. Since there is only one datapoint per country, it might as well have been a line of columns showing percentage of salary used by colouring part of the column red. The map medium does not help in anyway to provide the information.