This choropleth map displays world economies using a spectral color scale, with each country colored according to its economic classification. Users can click legend items to filter the map, highlighting countries matching the selected economy while dimming others. The visualization uses D3 v5 APIs including `d3.geoPath`, `d3.geoNaturalEarth1`, `d3.scaleOrdinal`, and `d3.schemeSpectral` to render SVG paths. Data comes from a World Atlas TopoJSON file joined with TSV metadata, and interactive zooming is enabled through D3's `zoom` event system.