Supply
- Cambridge IGCSE
- Economics
Speaker notes: This slide introduces the topic of supply within the context of the Cambridge IGCSE Economics curriculum. It sets the stage for the detailed exploration of supply in the following slides.
Learning Objectives
- Understand the concepts of individual and market supply.
- Explain movements along a supply curve.
- Analyse shifts of a supply curve due to various factors.
Speaker notes: By the end of this presentation, students should be able to understand and explain the key concepts related to supply, including individual and market supply, movements along a supply curve, and shifts of a supply curve.
Starter: The Bakery Example
- Imagine a bakery that can produce 100 loaves of bread per day at £1 each. What happens if the price increases to £1.50 per loaf?
Speaker notes: This starter question encourages students to think about how changes in price can affect the quantity supplied. It introduces the concept of supply and sets the stage for the detailed exploration of supply curves.
Individual and Market Supply
- Individual supply: Quantity a single producer is willing to supply at a given price.
- Market supply: Total quantity all producers are willing to supply at a given price.
- Supply depends on price, cost of production, and technology.
Speaker notes: Explain the difference between individual supply and market supply. Highlight that supply is influenced by various factors such as price, cost of production, and technology. Ask students to think about examples of individual and market supply in their daily lives.
Movements Along a Supply Curve
- A supply curve shows the relationship between price and quantity supplied.
- If price increases, quantity supplied increases (movement up the curve).
- If price decreases, quantity supplied decreases (movement down the curve).
Speaker notes: Introduce the supply curve and explain how movements along the curve represent changes in quantity supplied in response to changes in price. Use the example of the bakery to illustrate this concept.
Diagram: Movements Along a Supply Curve
Diagram explained
The x-axis shows the quantity of bread, and the y-axis shows the price of bread. The supply curve illustrates how the quantity supplied changes as the price changes. If the price increases, the quantity supplied increases, moving up the curve. If the price decreases, the quantity supplied decreases, moving down the curve.
- Identify the supply curve on the diagram.
- Note how the quantity supplied changes as you move up or down the curve.
- Understand that these movements are due to changes in price.
Speaker notes: This diagram illustrates the concept of movements along a supply curve. The x-axis represents the quantity of a good, and the y-axis represents the price of the good. The supply curve shows how the quantity supplied changes as the price changes.
Shifts of a Supply Curve
- Supply curve shifts when factors other than price change.
- Increase in supply: Curve shifts right (e.g., lower production costs).
- Decrease in supply: Curve shifts left (e.g., higher production costs).
Speaker notes: Explain that shifts of the supply curve occur when factors other than price change. Discuss examples such as lower production costs leading to an increase in supply and higher production costs leading to a decrease in supply.
Diagram: Shifts of a Supply Curve
Diagram explained
The x-axis shows the quantity of coffee, and the y-axis shows the price of coffee. The supply curve shifts to the right when there is an increase in supply, such as lower production costs. This results in a lower price and a higher quantity of coffee.
- Identify the initial supply curve on the diagram.
- Note the shift to the right when supply increases.
- Understand that this shift is due to factors other than price.
Speaker notes: This diagram illustrates the concept of shifts in a supply curve. The x-axis represents the quantity of a good, and the y-axis represents the price of the good. The supply curve shifts to the right when there is an increase in supply and to the left when there is a decrease in supply.
Worked Example: Supply Curve Shift
- Scenario: A new technology reduces the cost of producing smartphones.
- Step 1: Identify the factor causing the shift (lower production costs).
- Step 2: Determine the direction of the shift (right).
- Step 3: Explain the impact on price and quantity (lower price, higher quantity).
Speaker notes: This worked example illustrates how a shift in the supply curve affects price and quantity. Use the scenario of a new technology reducing the cost of producing smartphones to demonstrate the concept.
Common Mistakes and Exam Tips
- Confusing movements along the curve with shifts of the curve.
- Forgetting to consider factors other than price when analysing supply.
- Always label your diagrams clearly to avoid losing marks.
Speaker notes: Highlight common mistakes students make when analysing supply curves and provide tips on how to avoid them. Emphasise the importance of clear labelling in diagrams.
Key Terms
- Individual supply: Quantity supplied by one producer.
- Market supply: Total quantity supplied by all producers.
- Supply curve: Graph showing the relationship between price and quantity supplied.
- Shift: Change in supply due to factors other than price.
Speaker notes: Review key terms related to supply and ensure students understand their meanings. Encourage students to use these terms in their explanations and analyses.
Plenary: Quick-Check Questions
- What is the difference between individual and market supply?
- How does a change in price affect movements along a supply curve?
- What factors can cause a shift in the supply curve?
- Explain the impact of a rightward shift in the supply curve on price and quantity.
Speaker notes: These quick-check questions help students review the key concepts covered in the presentation. Encourage students to discuss their answers with their peers.
Plenary: Summary
- Understand individual and market supply, movements along a supply curve, and shifts of a supply curve.
Speaker notes: Summarise the key points covered in the presentation. Emphasise the importance of understanding individual and market supply, movements along a supply curve, and shifts of a supply curve.