“…However, there are some differences between emerging economies and developed economies in political, economic, and cultural aspects (35)(36)(37), and business cycles may have different effects on health expenditure. Second, most studies have discussed the counter-cyclical or pro-cyclical effects of business cycles on health expenditure from the following perspectives, such as medical affordability (6)(7)(8), environmental quality (9-13), universal healthcare (15), aging population (15), and population health (16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26). However, we find nearly no related studies that explore the above relationship from the role of income inequality.…”