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I wanted to build something that combined a proper backend with data visualisation. Aswath Damodaran’s equity risk premium research felt like a good subject — the data is rich, publicly available, and the charts tell a clear story about global market risk.

The stack is a Node/Express API reading from a SQLite database, a React frontend, and D3 for the charts. The data comes from Damodaran’s published spreadsheets, parsed and stored locally so the app stays self-contained.

It taught me how the ERP is constructed from historical equity returns and bond yields, and how much it varies by country and time period.