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

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, illustrating the connection between economic prosperity and social outcomes.

• Key Point: Economic growth is essential for improving health and reducing poverty.

• Example: In 2023, there were 263 million cases of malaria worldwide, with most deaths occurring in poor countries. Preventing these deaths requires economic growth.

Incomes and Growth Around the World

Global Differences in 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 opportunities for their citizens.

• Key Point: There are large differences in GDP per capita and growth rates across countries.

• Key Point: Some countries experience rapid growth, while others remain in poverty traps.

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: Table reconstructed from slide images and text. Shows variation in income and growth rates across countries.

Key Questions in Economic Growth

• Why are some countries richer than others?

• Why do some countries grow quickly while others remain stuck 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 average quantity of goods and services produced per unit of labor input. It is the most important determinant of a country's standard of living.

• Key Point: Higher productivity leads to higher real GDP and incomes.

• Formula:

$Y = \text{real GDP} = \text{quantity of output produced}$ $L = \text{quantity of labor}$ $\text{Productivity} = \frac{Y}{L}$

Why Productivity Is So Important

When a nation's workers are very productive, real GDP is large, and incomes are high. Rapid growth in productivity leads to rapid improvements in living standards.

• Key Point: Productivity growth is essential for long-run increases in living standards.

Determinants of Productivity

Physical Capital Per Worker

Physical capital refers to the stock of equipment and structures used to produce goods and services. The more capital each worker has, the higher their productivity.

• Formula: $K = \text{physical capital}$, $K/L = \text{capital per worker}$

• Key Point: An increase in $K/L$ leads to an increase in $Y/L$ (output per worker).

• Example: Factories, machines, and infrastructure.

Human Capital Per Worker

Human capital is the knowledge and skills workers acquire through education, training, and experience. More human capital per worker increases productivity.

• Formula: $H = \text{human capital}$, $H/L = \text{human capital per worker}$

• Key Point: An increase in $H/L$ leads to an increase in $Y/L$.

• Example: Education, on-the-job training, professional experience.

Technological Knowledge

Technological knowledge is society's understanding of the best ways to produce goods and services. Advances in technology boost productivity by enabling more output from the same resources.

• Key Point: Technological progress is a major driver of long-run growth.

• Example: Innovations such as computers, improved farming techniques, and new manufacturing processes.

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: more saving today enables more investment and higher future output.

• Key Point: Higher saving leads to more investment and faster growth.

• Example: Reducing consumption to fund the construction of new factories.

Investment from Abroad

Foreign investment can help raise capital per worker, productivity, and living standards. This can take the form of foreign direct investment (FDI) or foreign portfolio investment.

• Foreign direct investment: Capital investment owned and operated by a foreign entity.

• Foreign portfolio investment: Investment financed with foreign money but operated by domestic residents.

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

Education

Government policies that promote education increase human capital and productivity. Education is an investment in future productivity, but it involves a tradeoff with current earnings.

• Key Point: Each year of schooling raises a worker's wage by about 10% in the U.S.

• Example: Public schools, subsidized loans for college.

Institutions and Incentives

Institutions are the rules and organizations that shape economic incentives. Good institutions promote growth by protecting property rights, ensuring honest government, maintaining political stability, and providing a dependable legal system.

• Key Point: Corruption and weak institutions hinder economic growth.

• Example: Countries with low corruption (e.g., Denmark, Singapore) tend to have higher growth than those with high corruption (e.g., South Sudan, Venezuela).

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: Table reconstructed from slide images and text. Shows the impact of corruption on economic growth.

Free Trade

Trade policies affect economic growth. Outward-oriented policies (promoting trade and investment) foster integration with the world economy and tend to promote growth, while inward-oriented policies (restricting trade) often hinder growth.

• Key Point: Trade can make everyone better off and has similar effects as technological progress.

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

Research and Development (R&D)

Technological progress is the main reason why living standards rise over the long run. Knowledge is a public good, and policies that promote R&D can increase productivity and growth.

• Key Point: Patent laws, tax incentives, and grants for research encourage innovation.

• Example: Government grants for university research.

Summary and Application

Discussion: Effective Growth Policies

Policies that can boost growth and living standards in poor countries include:

• Tax incentives for investment by local and foreign firms

• Cash payments for good school attendance

• Cracking down on government corruption

• Allowing free trade

• Promoting research and development

Additional info: Giving away condoms is not directly related to economic growth, but may improve health outcomes.