A choropleth map of the world colors each country by its economy category, with a legend showing the ordinal color scale. The visualization uses D3.js with a natural Earth projection and topojson for geographic data. Hovering over a country highlights it in red and displays a tooltip with its name and economy value. The map features zooming via D3’s zoom event, and the color legend is built from D3’s `scaleOrdinal` with blue color schemes.