Max Ghenis
Policy entrepreneur, technologist, and economist. Co-founder and CEO of PolicyEngine.
Current work
Co-founder & CEO
Open source software to simulate tax and benefit policies in the US and UK. Our tools help policymakers, researchers, and the public understand how reforms affect households and society.
Recent writing
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How to Use MDX for Interactive Posts
This blog supports MDX, allowing you to embed React components, Plotly charts, and interactive elements directly in posts.
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VAT thresholds, revenues, and the role of counterfactuals
The Telegraph misread OBR projections on VAT threshold increases. The projected revenue gain comes from inflation indexing, not economic growth.
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My 2024 in Code: Personal Projects & AI Tools
A look back at personal coding projects built with AI assistance while leading PolicyEngine.
Side projects
Academic research
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What can LLMs tell us about the ETI?
August 2025
With Jason DeBacker. How LLMs perceive behavioral responses to tax policy.
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Beer Price Controls at Yankee Stadium
2025
Economic analysis of stadium pricing, externalities, and welfare.
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AI Model Policy Impact Forecasts
2024
Examining LLMs for forecasting policy outcomes under different administrations.
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Enhancing Survey Microdata with Administrative Records
November 2024
Novel approach to microsimulation dataset construction. Presented at NTA 2024.