Year 0
Low well-being
Medium
High well-being
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Run a country for a generation with your own budget priorities. Split each year's fixed spending across healthcare, education and economic policy, and watch life expectancy, schooling and income compound year over year using the same diminishing-returns and human-capital-growth logic that underlies real development economics. A crowd of citizens rendered in 3D rises, falls and changes color with the resulting Human Development Index — the UNDP's own geometric-mean formula over normalized life-expectancy, education and income sub-indices — while an inequality slider spreads individual outcomes around the national average so you can see the difference between a high average and a broadly shared one.