This choropleth map colors world countries according to their economy category using a spectral color scale. The visualization uses D3 v5’s `select`, `geoPath`, and `scaleOrdinal` APIs, with a `topojson` loader for geographic data from the world-atlas package. The map includes a custom legend built with the `colorLegend` module, and supports zooming via `d3.zoom`, while country boundaries are rendered as SVG paths with hover highlighting.