This choropleth map colors world countries by their economy category using an ordinal color scale with a spectral scheme. It renders geographic boundaries via the `geoPath` projection and `geoNaturalEarth1`, with data loaded from the world-atlas TopoJSON and TSV files. Hovering highlights a country in gray. The legend, built with custom code, uses circles and text to display the economy categories, while the map supports zooming through an event-driven `zoom` interaction.