This choropleth map visualizes GDP per capita (PPP) for countries in 2020, using a quantile color scale with a YlGnBu scheme to show economic disparities, while gray fills indicate missing data. Built with D3.js, it renders world geography via `geoNaturalEarth1` and `geoPath`, fetching TopoJSON from the visionscarto-world-atlas and parsing World Bank CSV data. The map uses `scaleQuantile` for color mapping, `Promise.all` to load datasets asynchronously, and dynamically resizes to the viewport.