A bubble chart built with D3 v7 analyzes retail store performance by plotting average transaction amounts against total transaction counts. Each bubble's radius encodes employee count, while color distinguishes store names using a categorical color scheme. The visualization includes axis labels, a legend, and interactive tooltips displaying store metrics on hover. Data is loaded from a CSV file and rendered as SVG circles, with all d3 scales and event handlers implemented in the bubbleChart.js file.