A choropleth map displays global economic classifications, with a linked color legend for interactive filtering. Clicking a legend category dims non-matching countries and highlights those selected. The visualization uses d3.geoNaturalEarth1 and d3.geoPath for projection, d3.zoom for panning, and d3.scaleOrdinal with schemeSpectral for colors. Data comes from TopoJSON world-atlas and TSV metadata, rendered as SVG paths with hover effects.