This example visualizes monthly spending across countries using a D3 pie chart. It displays each country’s GDP per capita as a proportional slice, with country names overlaid on the segments and a legend showing the dollar values. The chart is rendered as an SVG, using d3.pie, d3.arc, and d3.scaleOrdinal for slicing and coloring. Data is loaded asynchronously from a CSV file via d3.csv, and the legend is manually drawn with SVG rects and text elements.