This interactive choropleth map displays world countries colored by their economic classification using an ordinal color scale. Users can click legend items to filter and highlight countries matching the selected economy type, with non-matching countries fading to low opacity. The map uses d3.geoNaturalEarth1 projection and d3.geoPath for rendering country boundaries as SVG paths, with d3.zoom enabling pan and zoom interactions. Data comes from TopoJSON world atlas files, while the interactive legend is built with custom d3 selections and click handlers.