This choropleth map displays global economic data using a D3.js SVG rendering with an interactive color legend. Users can click legend entries to filter countries by their economic classification, while the map highlights the selected category and dims others. The visualization uses `d3.geoPath` with a natural Earth projection to draw country boundaries and a sequential color scale based on the spectral scheme. World country data and properties are loaded from the World Atlas TopoJSON and TSV files, with zoom and pan functionality powered by `d3.zoom`.