What are the main drivers of population aging in high-income countries, and what policy responses are common?

• A. Drivers: low fertility and longer life expectancy; responses: pension reform, healthcare expansion, immigration, and labor force participation incentives.
• B. Drivers: high fertility and shorter life expectancy; responses: reduce immigration.
• C. Drivers: rapid urbanization; responses: expansion of coal power.
• D. Drivers: increased birth rates; responses: reduce pensions.

Answer: (A)

The main concept here is that aging in high-income countries is driven by two forces: low fertility and longer life expectancy. When birth rates stay low, fewer young people enter the workforce, shrinking the base that supports workers and taxpayers. At the same time, people live longer thanks to better health care, nutrition, and living conditions, which raises the share of older individuals in the population. This combination increases the old-age dependency ratio and puts pressure on pension systems, health care, and the labor market.

The policy responses listed fit these pressures well. Pension reform aims to keep retirement systems financially sustainable as the number of retirees grows relative to workers. Healthcare expansion addresses the higher demand for elderly and chronic-care services that comes with more older people. Immigration is used to supplement the workforce, helping to balance the population age structure and support public finances. Incentives to raise labor force participation encourage people, including older workers, to stay active in the economy longer, offsetting some of the decline in the ratio of workers to dependents.

The other options describe drivers and responses that don’t match how aging actually unfolds in wealthy countries. For example, high fertility or shorter life expectancy would slow aging or reverse it, and urbanization or coal power don’t target the financial and labor-supply challenges aging creates.