This choropleth map visualizes global economic classifications by coloring each country according to a categorical scale derived from the `economy` property in the World Atlas dataset. The map uses a natural Earth projection and renders as SVG with D3’s `geoPath` and `geoNaturalEarth1`. Country boundaries are drawn with thin strokes, and hovering over a country turns it gray while a tooltip displays the country name and its economy group. A custom color legend, built with `scaleOrdinal` and `schemeSpectral`, appears in the lower-left corner. The map supports zooming through D3’s zoom event handler.