Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Economics
Lesson Topic: Link between individual supply and market supply
Learning Objective/s:
  • Describe the law of supply and how it shapes individual supply curves.
  • Explain how individual supply functions are combined to form market supply.
  • Construct a market supply schedule by horizontally adding individual firm quantities.
  • Plot and interpret the market supply curve.
  • Analyse how changes in the number of firms or input costs affect market supply.
Materials Needed:
  • Projector and screen
  • Whiteboard and markers
  • Printed supply schedule worksheets (Firm A & B data)
  • Graph paper or digital graphing tool
  • Calculator
  • Sticky notes for quick checks
 Introduction:
Begin with a quick poll: “If the price of a product doubles, what happens to a seller’s output?” Review the law of supply that students already know. Explain that today they will see how each firm’s decisions combine to shape the whole market and they will be able to create a market supply curve.
Lesson Structure:
  1. Do‑Now (5') – Students write a short answer to the poll question on sticky notes; teacher collects for a quick check.
  2. Mini‑lecture (10') – Review individual supply curve, law of supply, and introduce the supply function formula.
  3. Guided practice (12') – Using the worksheet, students calculate individual quantities for two firms at given prices and fill the market supply column.
  4. Whole‑class demonstration (8') – Teacher aggregates the numbers, shows how to sum horizontally, and draws the market supply curve on the board.
  5. Collaborative activity (10') – Small groups create a supply schedule for three firms, plot the market supply curve on graph paper or a digital tool, and identify the slope.
  6. Check for understanding (5') – Quick quiz (exit ticket) with two questions: one on constructing market supply and one on factors that shift it.
Conclusion:
Summarise that market supply is the horizontal sum of individual firms’ supplies and that its upward slope reflects the law of supply. Ask students to write one real‑world factor that could shift the market supply curve as an exit ticket. For homework, assign a brief problem where they add a third firm’s data to the existing schedule and redraw the curve.