This choropleth map colors countries by their economic classification, using a spectral color scale and an interactive legend to indicate the mapping. Users can zoom and pan the map, which is rendered with SVG paths generated by the `d3.geoPath` and `geoMercator` projections. The visualization loads country boundaries and metadata from the world-atlas TopoJSON and TSV files, processed via the `topojson` library. Hovering over a country highlights it in red and displays its name and economy in a tooltip.