hu2020 (copy)

Demographic Changes and Economic Growth: Impact and Mechanisms

Qian Hub, Xiaoyan Leia, Bo Zhao
National School of Development, Peking University, Beijing, China
School of Economics, Institute of Industry and Culture, Peking University, Beijing, China

Objective: Analyze the impact of population aging on economic growth using panel data from 172 countries (1960-2019).
Findings:
- Population aging significantly reduces economic growth rates.
- A 1 percentage point increase in the population over age 65 leads to a 2.6 percentage point decrease in per capita economic growth.
- Key channels affecting economic growth: capital accumulation, labor supply, and economic structure.
- Technological progress and human capital accumulation are not significant factors.
- Significant heterogeneity in impact across countries based on income levels.

Global Phenomenon: Population aging due to increased life expectancy, decreased mortality, and falling fertility rates.
Demographic Transition: Rapid aging in developing countries, particularly in East Asia (e.g., China).
Challenge: Developing countries face the risk of "growing old before becoming rich."

Mixed Views: Studies show both negative and positive impacts of population aging on economic growth.
- Negative impacts supported by Acemoglu and Johnson (2007), Lindh and Malmberg (1999), and Bloom et al. (2010).
- Positive impacts noted by An and Jeon (2006) and Cervellati and Sunde (2011).
Channels of Impact: Technological progress, capital accumulation, labor market dynamics, and economic structure.

Technological Progress:
- Aging may hinder innovation due to declining physical and cognitive abilities.
- Mixed evidence on whether aging promotes or hinders technological advancement.
Capital Accumulation:
- Aging population may reduce national saving rates due to demographic shifts.
- Mixed evidence on the relationship between aging and savings.
Labor Market and Human Capital:
- Aging reduces labor supply, affecting economic growth.
- Human capital accumulation may not automatically improve with aging.
Economic Structure:
- Aging leads to a shift from secondary to tertiary sectors, impacting growth rates.
- Changes in consumption patterns due to aging populations.

Data Analysis: Panel data from 172 countries over 60 years.
Key Findings:
- Aging population significantly reduces per capita GDP growth.
- Impact channels: capital accumulation, labor supply, and economic structure are significant; technological progress and human capital are not.
- Heterogeneity in impact: significant for middle- and high-income countries, not for low-income countries.

Model Specification: Regression models to estimate the impact of population aging on economic growth.
Control Variables: Include macroeconomic factors and fixed effects to account for unobserved heterogeneity.

Regression Results:
- Population aging negatively impacts GDP growth.
- The share of elderly population significantly reduces the saving rate and labor supply.
- Economic structure shifts towards services, reducing overall growth due to lower productivity in the tertiary sector.

Robustness Checks: Address potential endogeneity and confirm findings through various model specifications.
Heterogeneity Analysis: Impact of aging varies by income level, education, and capital stock.

Negative Impact: Population aging poses challenges to economic growth through reduced savings, labor supply, and shifts in economic structure.
Policy Suggestions:
1. Improve investment efficiency to counteract declining saving rates.
2. Develop a multi-level education system to enhance human capital.
3. Implement supportive policies for child-rearing and health care for the elderly to manage aging challenges.

Future Outlook: As birth rates decline and life expectancy rises, the implications of population aging will become more profound, necessarily.