This map visualizes the cost of living index across countries, using a blue-to-red color gradient where blue indicates higher costs and red indicates lower costs. Built with D3.js, it applies the `geoNaturalEarth1` projection and `geoPath` to render country outlines from TopoJSON data, while a `scaleSequential` color scale encodes the numeric index from the CSV dataset. The map also includes graticule lines and an outline for geographic context.