A stacked area chart displays monthly household expenses across seven categories—Housing, Food, Transportation, Utilities, Entertainment, Healthcare, and Education—from a CSV file. Each category is drawn as a semi-transparent filled area with a distinct color from `d3.schemeTableau10`, using `d3.area()` to compute paths. The x-axis uses a point scale for months, and the y-axis is linear for USD amounts. A legend identifies categories, with axes and labels rendered via `d3.axisBottom` and `d3.axisLeft` in SVG.