This bubble chart shows the relationship between electric car brands and their maximum price in euros. Each bubble’s vertical position and size encode the price, while color uses a plasma gradient to provide an additional visual cue. The chart is built with D3 v7, using the `d3.csv` loader to fetch data, `d3.group` and `d3.max` to aggregate by brand, and `d3.scaleBand`, `d3.scaleLinear`, `d3.scaleSqrt`, and `d3.scaleSequential` for the scales. Axes are drawn with `d3.axisBottom` and `d3.axisLeft`.