Health and Wealth among the Poor: India and South Africa Compared
指出健康和财富是福祉的两大核心，收入与健康存在双向因果关系，并检验了“越富裕越健康”假说，即收入决定健康且两者国际相关性足以让收入排名反映更广泛的福祉。
Health and wealth are the two most important components of well-being. Rankings of well-being based on income will differ from more comprehensive rankings depending on the way that income and health are related. There are strong bidirectional causal links between income and health so that we cannot understand either without understanding both. What we call the ?wealthier is healthier? hypothesis asserts both that income is the main determinant of health, and that the international correlation between income and health is sufficiently tight for income rankings to indicate well-being more broadly.