This choropleth map colors countries by their economy classification, using a sequential spectral color scale to distinguish categories. The visualization renders geographic boundaries with `d3.geoPath`, projecting the world using the Natural Earth projection and enabling zoom and pan through `d3.zoom`. The code loads world topology from TopoJSON and joins it with TSV metadata via `d3.tsv`, while a custom color legend component displays the categorical scale. Hovering highlights individual countries in red, and the map includes data from the world-atlas dataset.