Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 1st Term
Week: 6
Age: 15 years
Duration: 45 minutes
Subject: Economics
Curriculum Theme: Economics
Previous Lesson: Demand and Supply: Supply Meaning and Factors.
Topic: Concepts of Demand and Supply
Subject Matter: Determinants of equilibrium price; determinants of equilibrium quantity; equilibrium point; simple applications of equilibrium.

Specific Objectives

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

Cognitive Domain:

Define equilibrium price and equilibrium quantity.
Identify the equilibrium point on a demand and supply diagram.
List determinants of equilibrium price.
List determinants of equilibrium quantity.
Solve simple problems to find equilibrium price and equilibrium quantity from given schedules.
Apply equilibrium to simple real market situations (shortage and surplus).

Affective Domain:

Show interest in how prices settle in markets through bargaining and competition.
Appreciate fairness in buying and selling at market prices.

Psychomotor Domain:

Plot demand and supply curves and mark the equilibrium point correctly.
Use tables to compute and present equilibrium price and quantity neatly.

Participate actively in group discussion using market examples.
Work cooperatively to solve equilibrium questions and present answers.

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., Essential Economics for SSS, Book 1)
Encyclopaedia Britannica: Market Equilibrium
Khan Academy: Supply, Demand and Equilibrium
Investopedia: Equilibrium

Instructional Materials

The teacher will teach this lesson with the aid of:

Pictures of people buying and selling in markets and shops
Chart showing demand and supply curves with an equilibrium point
Sample demand and supply schedules on cardboard or chart paper
Graph sheets, ruler, pencil, and eraser
Board and markers/chalk

Rationale for the Lesson

This lesson helps pupils understand how prices and quantities are decided in markets when buyers and sellers interact. It also helps pupils explain common situations such as goods being too expensive, too cheap, scarce, or plenty.

Prerequisite/Previous Knowledge

Pupils already know the meaning of demand and supply, can read simple tables, and have seen bargaining and price changes in markets and shops.

Lesson Content/Board Summary

Market Equilibrium

Meaning of equilibrium price and equilibrium quantity

Equilibrium price is the price at which quantity demanded equals quantity supplied. Equilibrium quantity is the quantity bought and sold at the equilibrium price.

Equilibrium point

The equilibrium point is the point where the demand curve and supply curve intersect on a graph.

The following are features of the equilibrium point:

Quantity demanded equals quantity supplied.
No pressure for price to rise or fall.
It is shown at the intersection of demand and supply curves.

Determinants of equilibrium price

The following are determinants of equilibrium price:

Changes in demand – higher demand tends to raise equilibrium price; lower demand tends to reduce it.
Changes in supply – lower supply tends to raise equilibrium price; higher supply tends to reduce it.
Cost of production – higher costs can reduce supply and push equilibrium price up.
Government policies – taxes can raise equilibrium price; subsidies can reduce equilibrium price.
Expectations – expected future price changes can affect current demand and supply and change equilibrium price.

Determinants of equilibrium quantity

The following are determinants of equilibrium quantity:

Changes in demand – higher demand can increase equilibrium quantity; lower demand can reduce it.
Changes in supply – higher supply can increase equilibrium quantity; lower supply can reduce it.
Availability of inputs – adequate raw materials and labour can increase supply and equilibrium quantity.
Technology – improved technology can increase supply and equilibrium quantity.
Number of sellers – more producers can increase supply and equilibrium quantity.

Simple applications of equilibrium

The following are simple applications of equilibrium:

Shortage – occurs when quantity demanded is greater than quantity supplied at a given price; it can cause price to rise.
Surplus – occurs when quantity supplied is greater than quantity demanded at a given price; it can cause price to fall.
Market price determination – equilibrium helps explain how market prices settle through demand and supply.
Planning and decision-making – producers use equilibrium ideas to decide output levels and pricing.

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 market/shop pictures and asks pupils why the price of a good may stop changing after some time, then introduces equilibrium as the meeting point of demand and supply.
Pupils’ Activity: Pupils describe experiences of bargaining and how a final price is agreed upon in the market.
Learning Point: Market price can settle when buyers and sellers agree on a price and quantity.

Step 2: Meaning of equilibrium price and equilibrium quantity

Time: 7 minutes
Teaching Skill: Explanation
Teacher’s Activity: The teacher defines equilibrium price and equilibrium quantity and uses a simple table to show where quantity demanded equals quantity supplied.
Pupils’ Activity: Pupils state the meanings and identify the price and quantity where demand equals supply from a short example.
Learning Point: Equilibrium occurs where quantity demanded equals quantity supplied.

Step 3: Equilibrium point on a graph

Time: 8 minutes
Teaching Skill: Demonstration
Teacher’s Activity: The teacher draws demand and supply curves, labels axes, and marks the intersection as the equilibrium point with its price and quantity.
Pupils’ Activity: Pupils copy the diagram and label the equilibrium point correctly on their graph sheets.
Learning Point: The equilibrium point is where demand and supply curves intersect.

Step 4: Determinants of equilibrium price

Time: 7 minutes
Teaching Skill: Discussion
Teacher’s Activity: The teacher guides discussion on how changes in demand or supply can raise or reduce equilibrium price, using familiar goods as examples.
Pupils’ Activity: Pupils give examples of situations where demand increased or supply reduced and prices rose in the market.
Learning Point: Equilibrium price changes when demand or supply changes.

Step 5: Determinants of equilibrium quantity

Time: 6 minutes
Teaching Skill: Explanation and Questioning
Teacher’s Activity: The teacher explains factors that change equilibrium quantity and links them to production and availability of goods.
Pupils’ Activity: Pupils list factors and relate them to quantity of goods available for sale in markets.
Learning Point: Equilibrium quantity depends on changes in demand and supply conditions.

Step 6: Simple applications of equilibrium problems

Time: 7 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: The teacher provides a simple demand and supply schedule and guides pupils to find equilibrium price and quantity, then explains shortage and surplus using the same table.
Pupils’ Activity: Pupils solve the given equilibrium problem in pairs and state whether there is shortage or surplus at selected prices.
Learning Point: Equilibrium can be found from schedules and applied to shortage and surplus situations.

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 equilibrium price and equilibrium quantity.
State two determinants of equilibrium price.
State two determinants of equilibrium quantity.
From the schedules below, find the equilibrium price and equilibrium quantity: Price (₦) 10, 20, 30, 40; Quantity demanded 8, 6, 4, 2; Quantity supplied 2, 4, 6, 8.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summary and Reinforcement
Teacher’s Activity: The teacher summarises equilibrium price, equilibrium quantity, equilibrium point, and key determinants, then gives an assignment: draw demand and supply curves from a given schedule and label the equilibrium point and values.
Pupils’ Activity: Pupils copy the summary and assignment and ask questions where necessary.
Learning Point: Equilibrium explains how market price and quantity are determined and how shortages and surpluses occur.

Lesson Keywords

Equilibrium Price – the price at which quantity demanded equals quantity supplied.
Equilibrium Quantity – the quantity bought and sold at equilibrium price.
Equilibrium Point – the intersection of demand and supply curves.
Determinants – factors that influence price and quantity in the market.
Shortage – situation where quantity demanded is greater than quantity supplied.
Surplus – situation where quantity supplied is greater than quantity demanded.

Differentiation

Support learners who need help with a guided table showing where demand equals supply, while advanced learners solve extra questions on shortage and surplus at different prices and explain changes in equilibrium when demand or supply shifts.

Note for teachers using this lesson plan

Use familiar local goods and simple figures to make equilibrium calculations easy. Ensure pupils label axes correctly and always identify equilibrium by matching quantity demanded with quantity supplied before drawing conclusions.