GDP

The United States showed negative returns as accumulated GDP rose to its maximum. The GDP analysis found a generally rising relationship between normalized accumulated GDP and normalized expected maximum lifespan. The GDP-lifespan relationship showed diminishing returns because equal GDP additions produced progressively smaller lifespan gains. The article cautions that GDP does not isolate specific social determinants such as access to care or income inequality. GDP was used as a rough proxy for medical research, technology, social welfare, and health-related social conditions.