Introduction

In a market economy, the price of goods and services is determined by the interaction of demand and supply. The point where demand equals supply is known as market equilibrium.

Students studying Cambridge O Level Economics 2281 and Cambridge IGCSE Economics 0455 must understand how equilibrium price and equilibrium quantity are determined.

This concept helps explain how markets allocate resources efficiently.

What is Market Equilibrium?

Market equilibrium occurs when:

Quantity demanded = Quantity supplied

At this point:

• There is no shortage in the market

• There is no surplus in the market

• The market price becomes stable

The price at this point is called the equilibrium price.

The quantity bought and sold is called the equilibrium quantity.

Equilibrium Price

The equilibrium price is the price at which consumers are willing to buy exactly the same amount that producers are willing to sell.

At this price:

• Buyers can purchase the quantity they want

• Sellers can sell all the goods they produce

This creates a balanced market situation.

Surplus (Excess Supply)

A surplus occurs when:

Quantity supplied > Quantity demanded

This usually happens when the price is above the equilibrium price.

As a result:

• Producers have unsold goods

• Sellers may reduce prices to increase demand

This pushes the price downward toward equilibrium.

Shortage (Excess Demand)

A shortage occurs when:

Quantity demanded > Quantity supplied

This usually happens when the price is below the equilibrium price.

As a result:

• Consumers compete to buy limited goods

• Sellers may increase prices

This pushes the price upward toward equilibrium.

Equilibrium Diagram

In economics, equilibrium is shown using a demand and supply diagram.

The intersection of the demand curve and supply curve represents:

• Equilibrium price

• Equilibrium quantity

This intersection point shows where the market is balanced.

Importance of Market Equilibrium

Market equilibrium helps explain:

✔ How prices are determined in markets
✔ How resources are allocated efficiently
✔ How shortages and surpluses are eliminated

It is a key concept in understanding how a market economy functions.

Exam Tips for Students

Students studying O Level Economics (2281) and IGCSE Economics (0455) should be able to:

✔ Define equilibrium clearly
✔ Draw demand and supply diagrams
✔ Identify equilibrium price and quantity
✔ Explain shortages and surpluses

These diagrams often appear in structured economics exam questions.

Learn Economics with IVY Online

At IVY Online, students preparing for Cambridge Economics exams can access:

• Concept-based lectures

• Diagram explanations

• Past paper practice

• Exam-focused revision strategies

This helps students understand economic concepts clearly and perform well in exams.