Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Economics
Lesson Topic: Definition of PES
Learning Objective/s:
  • Define price elasticity of supply and calculate it using the percentage‑change formula.
  • Distinguish between elastic, unitary, inelastic, perfectly elastic and perfectly inelastic supply.
  • Explain how time horizon, input availability, spare capacity, factor mobility and nature of the good affect PES.
  • Analyse the impact of PES on resource allocation and policy decisions.
Materials Needed:
  • Projector and screen
  • Whiteboard and markers
  • Printed worksheet with PES calculation exercises
  • Graph paper and calculators
  • Economics textbook chapter on elasticity
  • PowerPoint slides summarising definitions and factors
  • Sticky notes for the opening poll
 Introduction:
Begin with a quick poll: “If the price of wheat doubled overnight, would farmers instantly double their output?” Connect this to prior learning on price elasticity of demand and state that today students will explore the supply side. Success criteria: students will be able to define PES, classify supply elasticity, and apply the formula to real‑world scenarios.
Lesson Structure:
  1. Do‑now (5'): Students answer the poll question on sticky notes and share responses (check understanding).
  2. Mini‑lecture (10'): Define PES, present the formula, and show simple numerical examples (direct instruction).
  3. Interactive classification (10'): Using the PES value list, students label supply curves on the board (guided practice).
  4. Factors influencing PES activity (15'): Small groups analyse the factors table and create a mind map linking each factor to elasticity type (collaborative).
  5. Application task (15'): Calculate PES for a given price/quantity change and predict supply response to a tax (independent practice, formative check).
Conclusion:
Recap that PES shows how quickly supply can adjust and why it matters for efficient resource allocation. Students complete an exit ticket: write one factor that makes supply more elastic and one that makes it inelastic. For homework, read the textbook section on PES and prepare a short example of a market where supply is perfectly elastic to share next class.