A choropleth map colors countries by their economy type, using a spectral color scale assigned through d3.scaleOrdinal. The map is drawn with d3.geoPath and the Natural Earth projection, while data is loaded asynchronously from World Atlas TSV and TopoJSON files. Hovering highlights countries in red, and a custom legend displays the color categories. The visualization supports zooming via d3.zoom, with zoom state handled through event transforms.