This choropleth map, built with D3.js, visualizes global economic classifications by country. It uses a spectral color scale from the `schemeSpectral` range, with countries colored according to their economy attribute. Users can click legend items to highlight specific economic groups, which dims non-matching countries. The map projects geographic features using `geoNaturalEarth1` with `geoPath`, and data is loaded from the world-atlas TopoJSON and TSV files.