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How much health does $26.3 billion of philanthropy buy? Drag the assumptions and watch a Monte Carlo cost-effectiveness model rerun in your browser.

Drag to see the estimate move. The model reruns in your browser.

Skeptical weights each effect by how well its study identifies causation. Credulous trusts every cited effect at face value.

Central value (mode) of a 0.55–1.10 triangular draw for the share of the studied effect a marginal unrestricted grant delivers — the whole distribution is sampled, not this number alone.

Real 2026 dollars. Default inflates each year's gifts ($26.39B nominal, 2020–2025) to ~$30.3B with CPI-U.