This choropleth map colors countries by their economic classification using a categorical color scale. The visualization uses D3 v5’s `geoPath` and `geoNaturalEarth1` projections to render world map topology, with an ordinal color legend showing the economy categories. Country data comes from the world-atlas TopoJSON and TSV files. Hovering highlights countries in red, while the legend uses D3’s `scaleOrdinal` and `schemeSpectral` for distinct color assignments.