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Theory of Demand and Supply in Economics.

Published on Aug 20, 2025 • Education

Introduction

Welcome viewers to this session on Economics. In today's lesson, we are focusing on the theory of demand and supply—a fundamental concept that drives all market activities.

Let’s get started with the questions and answers.

What is Demand?

Demand refers to the quantity of a good or service that consumers are willing and able to purchase at various prices. Simply put, what a consumer is willing to buy at a given price is called demand.

Effective Demand

There is also what we call effective demand, which does not just reflect willingness, but also the ability and capacity of the consumer to purchase the product. This is important because willingness without financial ability does not translate into actual market demand.

The Law of Demand

The law of demand states that, all things being equal, when the price of a good falls, the quantity demanded rises. Conversely, when the price increases, the quantity demanded falls. This inverse relationship is the foundation of consumer behavior in economics.

What is Supply?

On the other hand, supply refers to the quantity of a good or service producers are willing and able to offer for sale at different prices. Unlike demand, the law of supply shows a direct relationship: as price increases, the quantity supplied also increases.

The Law of Supply

The law of supply explains that higher prices act as an incentive for producers to supply more of a good or service, while lower prices discourage production.

Importance of Demand and Supply

The interaction between demand and supply helps to determine:

• Market Price of goods and services
• Quantity exchanged in the market
• Equilibrium point, where demand equals supply

Watch the full tutorial here: https://www.youtube.com/watch?v=8VpUcKXSPts

Conclusion

Understanding the theory of demand and supply is crucial for analyzing markets, predicting consumer behavior, and making informed business or policy decisions. Whether you are preparing for WAEC, NABTEB, JAMB, or IGCSE Economics exams, mastering this topic gives you a strong foundation in economic principles.

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