This choropleth map colors world countries by economic category using a sequential spectral color scale. The visualization, rendered as SVG with D3 v5, uses `d3.geoEqualEarth` projection and `d3.geoPath` to draw country boundaries from TopoJSON data sourced from the World Atlas. Users can pan and zoom via `d3.zoom`, while a legend built with custom D3 selections displays the color scale. Hovering highlights individual countries in red, and tooltips show country name and economic value.