This choropleth map colors world countries by economic classification using a spectral color scale, with a legend showing the ordinal categories. The map uses the Natural Earth dataset via TopoJSON and d3-geo's geoNaturalEarth1 projection. Users can zoom and pan through d3.zoom, and hovering highlights countries in red. The color legend is built with custom SVG components, while the map itself renders using the geoPath generator with tsv metadata joined to the geometry.