This bubble chart visualizes the relationship between GDP, population, and economic growth for ten global cities. Each circle's x-position maps to GDP, y-position to population, and radius to growth rate, with individual city colors shown in a legend. The visualization uses D3 v7's `csv`, `scaleLinear`, and `scaleSqrt` functions to load the CSV data and map values. It renders to SVG with axis labels and tooltips, positioning the legend at the chart's right edge.