This visualization shows a choropleth map of world countries colored by their economy classification, rendered on a natural Earth projection. Countries are drawn as SVG paths using `d3.geoPath` and `geoNaturalEarth1`, with data joined from TopoJSON and TSV files. The color scale uses `scaleOrdinal` with `schemeOrRd`, and interactive zooming is enabled through `d3.zoom`. Hovering highlights countries via CSS.