This horizontal bar chart displays the top 20 countries by unit cost, with each row’s bar length proportional to the value. The React component loads CSV data via `d3.csv`, slices the first 20 rows, and renders an SVG using `scaleBand` for the y-axis and `scaleLinear` for the x-axis. Axis ticks and labels are drawn manually, while the bars are simple `<rect>` elements. The chart includes red vertical gridlines and a title, with margins defining the plot area.