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

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Long-Run Economic Growth

Introduction

Long-run economic growth is a central topic in macroeconomics, focusing on the sustained increase in a country's output and living standards over time. Economic growth is closely linked to improvements in health, wealth, and overall well-being. For example, higher GDP per capita is associated with lower child mortality rates, demonstrating the importance of growth for societal outcomes.

Economic growth refers to the increase in the value of goods and services produced by an economy over time.
Health and wealth are interconnected; richer countries tend to have better health outcomes.
Example: In 2023, malaria caused 597,000 deaths, mostly among African children. Preventing such deaths is closely tied to economic growth.

Incomes and Growth Around the World

Global Patterns of GDP and Growth Rates

Countries differ significantly in their levels of income and rates of economic growth. These differences have profound effects on living standards and development outcomes worldwide.

There are large differences in GDP per capita across countries.
Growth rates also vary, leading to divergence in living standards over time.
Key questions: Why are some countries richer than others? Why do some grow quickly while others remain poor?

Country	GDP per capita, 2024	Growth Rate (1990–2024)
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: The table above compares GDP per capita and long-run growth rates for selected countries, illustrating the diversity in economic performance.

Key Questions in Economic Growth

Why are some countries richer than others?
Why do some countries grow quickly while others remain in poverty?
What policies can help raise growth rates and long-run living standards?

Productivity: The Engine of Growth

Definition and Measurement

Productivity is the most important determinant of a country's standard of living. It measures the efficiency with which inputs are converted into outputs.

Productivity: The average quantity of goods and services produced per unit of labor input.
Formula: , where is real GDP (output produced) and is quantity of labor.
Higher productivity leads to higher incomes and living standards.

Why Productivity Is So Important

When workers are more productive, the economy produces more output, resulting in higher incomes and improved living standards. Rapid productivity growth is essential for sustained improvements in well-being.

Large real GDP and high incomes are possible only with high productivity.
Growth in productivity drives growth in living standards.

Determinants of Productivity

Physical Capital Per Worker

Physical capital refers to the stock of equipment, machinery, and structures used in production. Increasing physical capital per worker raises productivity.

Physical capital (K): Equipment and structures used to produce goods and services.
Formula: (capital per worker).
More capital per worker leads to higher output per worker.
Example: Factories, computers, and vehicles are forms of physical capital.

Human Capital Per Worker

Human capital consists of the knowledge and skills acquired through education, training, and experience. It is a crucial factor in raising productivity.

Human capital (H): The skills and knowledge workers gain through education and experience.
Formula: (human capital per worker).
Higher human capital per worker increases output per worker.
Example: Years of schooling, professional training, and on-the-job experience.

Technological Knowledge

Technological knowledge refers to society's understanding of the best ways to produce goods and services. Advances in technology boost productivity by enabling more efficient production methods.

Technological progress: Any advance in knowledge that increases productivity.
Examples: The development of computers, improved agricultural techniques, and automation.
Technological knowledge is often considered a public good, as it can be shared and used by many.

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.

Boosting productivity requires increasing capital, which needs investment.
Producing more capital goods means fewer consumption goods today (tradeoff).
Formula:

Investment from Abroad

Foreign investment can help raise capital per worker, productivity, and living standards, especially in developing countries.

Foreign direct investment (FDI): Capital investment owned and operated by a foreign entity.
Foreign portfolio investment: Capital investment financed with foreign money but operated by domestic residents.
International organizations (e.g., World Bank, IMF) facilitate foreign investment in poor countries.

Education

Government policies that promote education increase human capital and productivity. Education involves a tradeoff between current income and future earnings.

Public schools and subsidized loans are examples of investment in human capital.
Each year of schooling raises a worker's wage by about 10% in the U.S.
Tradeoff: Time spent in school means sacrificing current wages for higher future income.

Institutions and Incentives

Institutions are the rules and norms that shape economic incentives. Good institutions promote growth by protecting property rights, ensuring honest government, and maintaining political stability.

Institutions of economic growth include:
- Property rights
- Honest government
- Political stability
- Dependable legal system
Corruption undermines growth by distorting incentives and reducing investment.

Least Corrupt Countries (2024)	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	Sudan

Additional info: Countries with low corruption tend to have higher growth and living standards.

Free Trade

Trade policies affect economic growth by influencing integration with the world economy. Outward-oriented policies promote growth, while inward-oriented policies often hinder it.

Inward-oriented policies: Tariffs, restrictions on foreign investment, and limited trade.
Outward-oriented policies: Elimination of trade barriers, promotion of foreign investment.
Trade increases productivity and living standards, similar to technological progress.
Examples: South Korea, Singapore, and Taiwan succeeded with outward-oriented policies; Argentina failed with inward-oriented policies.

Research and Development (R&D)

Technological progress is the main driver of long-run growth. Knowledge is a public good, and policies that promote R&D can boost productivity.

Patent laws protect inventors and encourage innovation.
Tax incentives and direct support for private sector R&D stimulate technological advancement.
Grants for basic research at universities expand the knowledge base.

Summary and Discussion

Long-run economic growth depends on productivity, which is determined by physical capital, human capital, technological knowledge, and sound institutions. Public policy plays a crucial role in shaping these determinants and promoting sustained improvements in living standards.

Effective policies include promoting education, encouraging investment, supporting R&D, and maintaining honest institutions.
Trade and openness to foreign investment are key drivers of growth.