Long-Run Economic Growth: Determinants, Measurement, and Policy

Long-Run Economic Growth

Introduction

Economic growth is a central topic in macroeconomics, as it determines the long-term improvement in living standards and well-being. The relationship between health and wealth is evident: higher economic growth leads to better health outcomes, such as lower child mortality rates. This section introduces the importance of economic growth and its impact on global development.

• Economic growth refers to the sustained increase in a country's output of goods and services (real GDP) over time.

• Higher GDP per capita is associated with higher survival rates and improved quality of life.

• Example: In 2023, there were 263 million cases of malaria worldwide, with most deaths occurring in low-income countries. Economic growth is crucial for preventing such deaths by improving access to healthcare and resources.

Incomes and Growth Around the World

Global Differences in Income and Growth

There are significant differences in income levels and growth rates across countries. Understanding these differences is key to analyzing why some nations are wealthier than others and why some experience rapid growth while others remain in poverty.

• GDP per capita is a common measure of average income and living standards in a country.

• Growth rates of GDP per capita vary widely, influencing how quickly living standards improve.

Country	GDP per capita, 2024	Growth Rate (1990–2024, % per year)
China	$23,846	8.2
India	$9,817	4.5
Rwanda	$3,265	4.1
Singapore	$132,570	3.3
Philippines	$10,376	2.5
Columbia	$18,504	1.9
United States	$75,491	1.6
Chad	$2,606	1.5
New Zealand	$48,163	1.4
Brazil	$19,648	1.3
United Kingdom	$52,518	1.3
Spain	$48,373	1.3
Russia	$41,705	1.2
Japan	$46,097	0.8

Additional info: Table shows the wide variation in both income levels and growth rates across countries, highlighting the importance of understanding the determinants of growth.

Key Questions in Economic Growth

• Why are some countries richer than others?

• Why do some countries grow quickly while others remain in a poverty trap?

• What policies can help raise growth rates and long-run living standards?

Productivity: The Engine of Growth

Definition and Measurement of Productivity

Productivity is the most important determinant of a country's standard of living. It measures how efficiently resources are used to produce goods and services.

• Productivity is the average quantity of goods and services produced per unit of labor input.

• Formula: $\text{Productivity} = \frac{Y}{L}$ where $Y$ = real GDP (output produced), $L$ = quantity of labor (number of workers or hours worked).

• Higher productivity leads to higher real GDP and higher incomes.

Why Productivity Is So Important

• When workers are more productive, the economy produces more output, raising incomes and living standards.

• Rapid productivity growth leads to rapid improvements in living standards over time.

• Understanding what determines productivity is essential for promoting long-run economic growth.

Determinants of Productivity

Physical Capital Per Worker

Physical capital refers to the stock of equipment and structures used to produce goods and services.

• Physical capital (K): Machines, tools, buildings, and infrastructure.

• Capital per worker: $\frac{K}{L}$

• Increasing capital per worker raises productivity: more or better equipment allows workers to produce more output.

Human Capital Per Worker

Human capital is the knowledge and skills that workers acquire through education, training, and experience.

• Human capital (H): Education, skills, and health of the workforce.

• Human capital per worker: $\frac{H}{L}$

• More human capital increases productivity: better-educated and skilled workers can produce more and higher-quality output.

Technological Knowledge

Technological knowledge is society's understanding of the best ways to produce goods and services.

• Includes inventions, innovations, and improvements in production processes.

• Technological progress means any advance that allows society to get more output from the same resources.

• Examples: The development of computers, the internet, or new agricultural techniques.

Economic Growth and Public Policy

Saving and Investment

Increasing the stock of physical capital requires investment, which is funded by saving. There is a tradeoff between current consumption and future growth.

• Producing more capital goods today requires reducing consumption (saving more).

• Higher saving leads to more investment, which increases capital per worker and productivity.

• Tradeoff: Sacrificing current consumption for higher future living standards.

Investment from Abroad

Foreign investment can help countries increase their capital stock and productivity.

• Foreign direct investment (FDI): Capital investment owned and operated by a foreign entity (e.g., a foreign company building a factory).

• Foreign portfolio investment: Investment financed by foreigners but operated by domestic residents (e.g., foreign purchase of domestic stocks or bonds).

• International organizations like the World Bank and IMF help channel investment to developing countries.

Education

Investment in human capital through education raises productivity and long-run growth.

• Public policies: Public schools, subsidized loans, and grants for higher education.

• Each additional year of schooling can significantly increase a worker's wage (e.g., by about 10% in the U.S.).

• Tradeoff: Time spent in school means forgoing current income for higher future earnings.

Institutions and Incentives

Institutions are the formal and informal rules that shape economic incentives and behavior.

• Key institutions for growth: Property rights, honest government, political stability, and a dependable legal system.

• Corruption and weak institutions hinder economic development.

Top Least Corrupt Countries (2024)	Top Most Corrupt Countries (2022)
Denmark	South Sudan
Finland	Somalia
Singapore	Venezuela
New Zealand	Syria
Luxembourg	Yemen
Norway	Libya
Switzerland	Equatorial Guinea
Sweden	Nicaragua
Netherlands	Sudan
Australia	Iran

Additional info: Countries with strong institutions tend to have higher growth and income levels.

Trade Policy

Trade policies can significantly affect economic growth by influencing a country's integration with the world economy.

• Inward-oriented policies: Tariffs and restrictions on foreign investment, aiming to protect domestic industries but often leading to lower growth.

• Outward-oriented policies: Reducing trade barriers and encouraging foreign investment, promoting integration and higher growth.

• Example: South Korea, Singapore, and Taiwan experienced rapid growth after adopting outward-oriented policies.

Research and Development (R&D)

Technological progress is the main driver of long-run growth. Knowledge is a public good that can be shared and used by many.

• Policies to promote R&D: Patent laws, tax incentives, direct support for private sector R&D, and grants for university research.

• Encouraging innovation increases productivity and living standards.

Summary Table: Determinants of Long-Run Economic Growth

Determinant	Description	Policy Example
Physical Capital	Machines, infrastructure, equipment	Investment incentives, infrastructure spending
Human Capital	Education, skills, health	Public education, health programs
Technological Knowledge	Innovations, R&D	Patent protection, R&D subsidies
Institutions	Property rights, legal system, governance	Anti-corruption measures, legal reforms
Trade Policy	Openness to trade and investment	Reducing tariffs, trade agreements

Discussion: Policy Choices for Growth

Effective policies for promoting long-run growth in poor countries include:

• Offering tax incentives for investment (both local and foreign)

• Improving education and school attendance

• Cracking down on government corruption

• Allowing free trade

• Promoting research and development

Additional info: Restricting imports or focusing only on short-term solutions (e.g., giveaways) is generally less effective for long-run growth.