Long-Run Economic Growth

Chapter Overview and Learning Objectives

This chapter examines the nature, benefits, costs, and sources of long-run economic growth, as well as the relationships between investment, saving, and growth. It also introduces key growth theories and discusses the challenges posed by resource exhaustion and environmental degradation.

• Discuss the costs and benefits of economic growth.

• List four important sources of growth in potential GDP.

• Describe the relationship between investment, saving, and long-run growth.

• Explain the main elements of Neoclassical growth theory in which technological change is exogenous.

• Discuss advanced growth theories based on endogenous technical change and increasing returns.

• Explain why resource exhaustion and environmental degradation create serious challenges for public policy directed at sustaining economic growth.

The Nature of Economic Growth

Economic growth refers to the sustained increase in a country’s output of goods and services, typically measured by real GDP. Growth can be assessed using several metrics:

• Real GDP: The total value of all final goods and services produced, adjusted for inflation.

• Real GDP per capita: Real GDP divided by the population, indicating average living standards.

• Real GDP per employed worker: A measure of productivity.

Table: The Cumulative Effect of Economic Growth

This table demonstrates how small differences in annual growth rates can lead to large differences in income over time.

Small differences in growth rates compound over time, dramatically affecting future income levels.

Benefits of Economic Growth

Rising Average Living Standards

• Material living standards: Economic growth increases average income, improving access to goods and services.

• Changing consumption patterns: As incomes rise, societies tend to shift consumption from tangible goods to services.

• Environmental demand: Higher incomes often lead to increased demand for a cleaner environment.

Addressing Poverty and Income Inequality

• Recent aggregate income growth has disproportionately benefited top earners, increasing income inequality.

• While average per capita incomes rise, poverty and inequality remain significant policy challenges.

Costs of Economic Growth

Forgone Consumption

• Growth requires investment, which often means sacrificing current consumption for future gains.

Social Costs

• Economic growth can disrupt businesses and workers, leading to obsolete skills and social adjustment costs.

Sources of Economic Growth

Four major determinants drive economic growth:

1. Growth in the labour force: An increase in the number of workers expands productive capacity.

2. Growth in human capital: Improvements in education, skills, and health enhance worker productivity.

3. Growth in physical capital: Investment in machinery, infrastructure, and technology increases output.

4. Technological improvement: Innovations and advancements raise efficiency and potential output.

Different economic growth theories emphasize these sources to varying degrees.

Key Formula: Compounding Growth

The future value of an initial amount after years at an annual growth rate is:

Example: If , (5%), and , then .

Summary Table: Benefits and Costs of Economic Growth

Additional info:

• Economic growth is a central topic in macroeconomics, influencing policy decisions and societal well-being.

• Understanding the sources and consequences of growth is essential for evaluating long-term economic strategies.