This choropleth map colors world countries by their economy category using an ordinal color scale with a spectral scheme, and displays a color legend with clickable circles. It renders geographic boundaries with antialiased SVG paths via `d3.geoPath` and the Natural Earth projection, while loading data from the world-atlas package (TSV metadata and TopoJSON geometries) and processing it with `topojson.feature`. Hovering highlights a country in red, and the map supports zooming through the `d3.zoom` interaction.