This interactive scatter plot maps 115 countries by cost of living (x-axis) against local purchasing power (y-axis). Circle size reflects global rank, while color encodes the purchasing-power-to-cost ratio, from green ("Excellent") to red ("Poor"). A dashed diagonal line marks equal ratios, with quadrant labels for context. Built with React, D3.js (v7) `scaleLinear` and `axisBottom`, the visualization supports hover tooltips, click-to-select country highlighting, and a clear-selection control. Data comes from a bundled `data.csv` file.