Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 2nd Term
Week: 5
Age: 15 years
Duration: 45 minutes
Subject: Economics
Curriculum Theme: Economics
Previous Lesson: Firms and Industry: Quoted and Unquoted Companies and Securities.
Topic: Population
Subject Matter: Meaning of population in economics; determinants of population; implications of population size and growth; Malthusian theory; demographic transition theory.

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define population in economics.
List determinants of population.
State implications of population size for development.
State implications of population growth for development.
Explain the main idea of the Malthusian theory.
Explain the stages of the demographic transition theory.

Affective Domain:

Show interest in population information for planning and development.
Appreciate the importance of responsible family and community decisions that affect population trends.

Psychomotor Domain:

Read and compare population figures from simple charts and tables.
Draw a simple trend line from given population data.

Work in groups to compare population data of different countries and present findings.
Participate respectfully in class discussions on population and development issues.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
State Unified Scheme of Work
Recommended Economics textbook for Senior Secondary Schools (e.g., Comprehensive Economics for SSS, Book 1)
World Bank Data: Population, total
United Nations DESA: Population Division
Encyclopaedia Britannica: Demographic transition

Instructional Materials

The teacher will teach this lesson with the aid of:

Population charts and tables for Nigeria and selected countries
Demographic visuals (population pyramid samples)
Materials showing occupation and sex distribution
Map of the world/Africa and Nigeria
Board and markers/chalk

Rationale for the Lesson

This lesson helps pupils understand how population size and growth affect jobs, housing, schools, and health services. It also helps pupils interpret population data and relate it to development issues in Nigeria and other countries.

Prerequisite/Previous Knowledge

Pupils can read simple tables and graphs and have basic knowledge of countries and states, including Nigeria and selected countries outside Nigeria.

Lesson Content/Board Summary

Population in Economics

Meaning of population in economics

Population in economics refers to the total number of people living in a given area (country, state, or community) at a particular time, which forms the labour force and the consumers of goods and services.

Determinants of population

The following are determinants of population:

Birth rate (fertility rate)
Death rate (mortality rate)
Migration (immigration and emigration)
Health services and medical care
Food supply and standard of living
Government policies (e.g., family planning, immigration rules)
Education level and cultural/religious practices
War, insecurity, and natural disasters

Implications of population size

The following are implications of population size:

Labour supply: large population may provide more workers.
Market size: large population can increase demand for goods and services.
Pressure on social services: schools, hospitals, and housing may be overstretched.
Public spending needs: government may spend more on infrastructure and welfare.
Unemployment/underemployment risk if jobs do not increase with population.

Implications of population growth

The following are implications of population growth:

Rising demand for food, water, housing, and transport.
Possible increase in unemployment if job creation is slow.
Higher dependency ratio when the working population is smaller than dependants.
Environmental pressure such as waste, pollution, and land scarcity.
Economic growth opportunity if growth is matched with education, skills, and investment.

Malthusian theory

Malthusian theory states that population tends to grow faster than food supply if unchecked, leading to shortages and hardship. It suggests that population growth can be limited by preventive checks (e.g., delayed marriage) and positive checks (e.g., famine, disease, war).

The following are key points of the Malthusian theory:

Population increases rapidly when there are no controls.
Food supply increases more slowly than population.
Shortages can lead to poverty and high cost of living.
Checks can reduce population growth rates.

Demographic transition theory

Demographic transition theory explains changes in birth rate and death rate as a country develops, leading to changes in population growth over time.

The following are the stages of demographic transition:

Stage 1: high birth rate and high death rate (slow population growth).
Stage 2: high birth rate and falling death rate (rapid population growth).
Stage 3: falling birth rate and low death rate (slower population growth).
Stage 4: low birth rate and low death rate (stable population).

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher displays a simple population table for Nigeria and two other countries and asks pupils to observe differences in size and growth trend.
Pupils’ Activity: Pupils read the figures aloud and mention which country appears most populated and which is least populated from the table.
Learning Point: Population figures can be compared to understand differences between countries.

Step 2: Meaning of population in economics

Time: 8 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains population in economics and writes the definition on the board, linking population to consumers and labour force.
Pupils’ Activity: Pupils copy the definition and give simple examples of how population affects demand for goods and services.
Learning Point: Population influences labour supply and demand for goods and services.

Step 3: Determinants of population

Time: 8 minutes
Teaching Skill: Questioning and Board Work
Teacher’s Activity: The teacher guides pupils to list determinants of population and groups them into natural increase (births and deaths) and migration, then records key points.
Pupils’ Activity: Pupils list determinants and explain one determinant using a local example.
Learning Point: Birth rate, death rate, and migration are major determinants of population.

Step 4: Implications of population size and growth

Time: 9 minutes
Teaching Skill: Discussion and Illustration
Teacher’s Activity: The teacher uses charts and demographic visuals to explain implications of population size and growth for jobs, schools, housing, and health services.
Pupils’ Activity: Pupils discuss implications in groups and present two positive and two negative implications.
Learning Point: Population size and growth can create opportunities and challenges for development.

Step 5: Malthusian theory

Time: 5 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher explains the Malthusian theory and highlights the idea of population growth outpacing food supply, including preventive and positive checks.
Pupils’ Activity: Pupils state the main idea of the theory and mention one preventive check and one positive check.
Learning Point: Malthusian theory links rapid population growth with pressure on food and resources.

Step 6: Demographic transition theory and data comparison

Time: 5 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher outlines the stages of demographic transition and guides pupils to match simple country examples to possible stages using given data (birth rate and death rate patterns).
Pupils’ Activity: Pupils match examples to stages and explain their choices using the data provided.
Learning Point: Countries move through stages as birth and death rates change with development.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define population in economics.
List five determinants of population.
State four implications of population growth on development.
Explain the main idea of the Malthusian theory and state two checks to population growth.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 0 minutes
Teaching Skill: Summary
Teacher’s Activity: The teacher summarises key points and gives an assignment: compare Nigeria’s population with two other countries using a chart and write three implications for development; list the stages of demographic transition.
Pupils’ Activity: Pupils copy the summary and assignment.
Learning Point: Population concepts and theories can be applied to explain development issues.

Lesson Keywords

Population – the total number of people living in a place at a particular time.
Birth rate – the number of births in a population over a period.
Death rate – the number of deaths in a population over a period.
Migration – movement of people into or out of an area.
Population growth – increase in population size over time.
Dependency ratio – comparison of dependants to working-age population.
Malthusian theory – view that population may grow faster than food supply without checks.
Demographic transition – stages of change in birth and death rates as a country develops.

Differentiation

Support learners with simplified charts and guided questions for interpreting data, while advanced learners analyse a short country case and identify likely demographic transition stage with reasons.

Note for teachers using this lesson plan

Use clear and current population charts suitable for pupils’ level and keep explanations brief and exam-focused. Encourage pupils to relate implications to local community issues such as schooling, housing, and employment without lengthy debates.