A choropleth map visualizes global economic data by country, with color encoding based on a scale domain. The map supports interactive filtering: users click entries in a color legend to highlight matching countries and dim all others, while a hover effect is also present. The visualization is built with D3 v5, using `d3.geoPath` and `d3.geoNaturalEarth1` for map projections. Data processing uses the `topojson` library to convert TopoJSON data for rendering. The map displays world country outlines from a world-atlas dataset, with a tooltip showing country names and values.