This example displays a world map where each country is colored according to its economic status, using a spectral color scale. The map also shows primary balance data in tooltips when hovering over countries. A custom color legend on the left allows users to filter countries by clicking on specific economic categories, which dims non-selected values. The visualization uses d3.geoPath with a geoEquirectangular projection, d3.scaleOrdinal for coloring, and d3.zoom for interactive panning.