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Demand, Supply, and Equilibrium

Analyzing fundamental market forces and price determination.

Core Definitions

These three concepts form the bedrock of microeconomic theory, defining how markets operate.

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Demand

Demand is the quantity of a good or service consumers are willing and able to buy at different prices over a period.
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Supply

Supply is the quantity of a product that producers are willing and able to sell at various prices.
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Equilibrium

Equilibrium is the point where demand equals supply—the market "clears", meaning there is neither surplus nor shortage.

Market Mechanism

Understanding how market forces naturally push towards the clearing price.

How Demand and Supply Interact to Establish Equilibrium

At the equilibrium price, sellers supply exactly the amount buyers want to buy. If price is above equilibrium, supply exceeds demand (surplus), causing prices to fall. If price is below equilibrium, demand exceeds supply (shortage), causing prices to rise. Market forces push prices towards equilibrium.

Demand Drivers

Factors that influence demand (shifts in the demand curve).

1

Price

Generally, higher prices reduce demand (law of demand).
2

Consumer Income

Higher income increases demand for normal goods.
3

Prices of Related Goods

Substitutes and complements affect demand.
4

Consumer Preferences

Trends, tastes, and advertising influence demand.
5

Expectations

If consumers expect prices to rise, they may buy more now.
6

Population

More consumers typically increase demand.

Supply Drivers

Factors that influence supply (shifts in the supply curve).

1

Price

Higher prices motivate more supply.
2

Costs of Production

Lower costs increase supply.
3

Technology

Improved technology can increase supply.
4

Number of Suppliers

More producers increase supply.
5

Expectations

If prices are expected to rise, producers may withhold supply temporarily.
6

Government Policies

Taxes, subsidies, and regulations affect costs and supply.

Equilibrium Shifts

Predicting the change in price and output based on market shifts.

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Demand Increase (Supply Constant) Increase in demand with constant supply leads to higher price and output.
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Supply Increase (Demand Constant) Increase in supply with constant demand leads to lower price and higher output.
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Simultaneous Shifts Simultaneous shifts cause complex effects that depend on magnitudes of shifts.

Visualizing the Market

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Demand and Supply Diagrams:

A demand curve slopes downward showing inverse relationship (price increases, demand decreases). The supply curve slopes upward showing direct relationship (price increases, supply increases). The intersection determines equilibrium price and quantity. Changes in demand or supply shift the curves, altering equilibrium.

Defining Imbalance

Market states when the price is not at equilibrium.

Excess: Q Supplied > Q Demanded
Excess (surplus): Occurs when price is above equilibrium; quantity supplied quantity demanded.
Shortage: Q Demanded > Q Supplied
Shortage: Occurs when price is below equilibrium; quantity demanded quantity supplied.

Outcomes of Imbalance

The economic implications of prolonged surplus or shortage.

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Evaluation of Excess Excess supply can lead to wasted goods, reduced profits, and price cuts.
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Evaluation of Shortage Shortages may cause lost sales and customer dissatisfaction but may also signal the need to raise prices or increase production.
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Demand, Supply & Equilibrium Deck
Term
Demand

What is demand?

Answer
Definition

The quantity of a good or service consumers are willing and able to buy at different prices over time.

Term
Supply

What is supply?

Answer
Definition

The quantity of a product producers are willing and able to sell at various prices.

Term
Market Equilibrium

What does market equilibrium mean?

Answer
Definition

The point where demand equals supply and there is no surplus or shortage.

Term
Price Above Equilibrium

What happens if the price is above equilibrium?

Answer
Explanation

Supply exceeds demand, causing a surplus and downward pressure on prices.

Term
Price Below Equilibrium

What happens if the price is below equilibrium?

Answer
Explanation

Demand exceeds supply, causing a shortage and upward pressure on prices.

Term
Determinants of Demand

Name two determinants of demand.

Answer
Examples

Consumer income and prices of related goods.

Term
Determinants of Supply

Name two determinants of supply.

Answer
Examples

Costs of production and technology.

Term
Increase in Demand

How does an increase in demand affect price and output if supply is constant?

Answer
Effect

Price and output both increase.

Term
Increase in Supply

How does an increase in supply affect price and output if demand is constant?

Answer
Effect

Price decreases and output increases.

Term
Demand Curve Shape

What shape does a demand curve have and why?

Answer
Explanation

It slopes downward due to the inverse relationship between price and demand.

Term
Supply Curve Shape

What shape does a supply curve have and why?

Answer
Explanation

It slopes upward due to the direct relationship between price and supply.

Term
Surplus

What is a surplus?

Answer
Definition

When quantity supplied is greater than quantity demanded at a given price.

Term
Shortage

What is a shortage?

Answer
Definition

When quantity demanded is greater than quantity supplied at a given price.

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🌸 Demand, Supply, and Equilibrium Quiz

1. What occurs at market equilibrium?

Equilibrium is where quantity demanded matches quantity supplied, meaning no surplus or shortage.

2. If the price of a good rises above its equilibrium price, what typically happens?

At prices above equilibrium, suppliers offer more than consumers want, creating excess supply.

3. Which factor is NOT a determinant of demand?

Technology affects supply, not demand.

4. An increase in the number of producers in the market is likely to:

More suppliers typically increase total market supply.

5. When consumer incomes rise, demand for normal goods usually:

Higher income allows consumers to buy more normal goods.

6. How does an improvement in technology affect the supply curve?

Technology improvements lower production costs, increasing supply at every price.

7. What happens when demand increases but supply remains unchanged?

Increased demand creates scarcity at original price, pushing price and quantity sold up.

📊 Results

  • Notes and Quiz
  • Business
  • AS Level
  • Marketing
  • OCR