[Correspondence] Health economics
Joseph L Dieleman and colleagues1 assessed, measured, and extrapolated time trends and relationships between economic development, demographic transition, and health financing indicators to estimate health spending by source for 184 countries in 2013–40. In developed countries, health expenditures increase rapidly according to ageing of the societies. Considering the limited increases in governmental incomes, it is important to restrict health expenditures to make a health system sustainable. Notably, prepaid private insurance played an important part in the health system of many high-income countries in Dieleman’s study.