This visualization shows a world map colored by each country's economy category, with a legend displaying the color scale on the left side. The map uses a natural Earth projection, rendered as SVG paths with a blue ordinal color scheme. The code loads geographic data from world-atlas TopoJSON and country metadata from a TSV file, merging them via ISO country codes. Interaction includes zooming via d3.zoom and a hover effect that turns countries red. The color legend is built with custom d3 selections, circles, and text labels.