A choropleth map displays global economies using color coding derived from world-atlas TopoJSON data, with countries shaded by income group. Users can filter the map by clicking color legend items, which highlights matching countries and dims others. The visualization uses d3.geoNaturalEarth1 projections, d3.geoPath for country outlines, d3.zoom for panning, and d3.scaleOrdinal with schemeSpectral colors. Hovering changes country fill to red, and tooltips reveal country names and values.