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Market Structure Spectrum

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About This MicroSim

This MicroSim lets you explore the four main market structures -- Perfect Competition, Monopolistic Competition, Oligopoly, and Monopoly -- by dragging a marker along a continuous spectrum. As you move the marker, characteristics such as number of firms, product type, pricing power, and entry barriers update dynamically. This helps students understand that market structures are not rigid categories but exist along a gradient, and that moving toward monopoly gives firms more pricing power at the expense of consumer choice.

How to Use

  1. Drag the marker along the colored spectrum bar to smoothly transition between market structures.
  2. Click the buttons at the bottom (Perfect Comp., Monopolistic, Oligopoly, Monopoly) to jump directly to a specific market structure.
  3. Observe the dot visualization showing how the number of firms changes as you move along the spectrum -- many small dots for competition, fewer large dots for monopoly.
  4. Read the characteristics panel to see how number of firms, product type, pricing power, entry barriers, and example industries change at each position.
  5. Check the consumer impact note at the bottom for a summary of how each market structure affects consumers.

Iframe Embed Code

You can add this MicroSim to any web page by adding this to your HTML:

<iframe src="https://dmccreary.github.io/economics-course/sims/market-structure-spectrum/main.html"
        height="532px"
        width="100%"
        scrolling="no"></iframe>

Lesson Plan

Grade Level

9-12 (High School Economics)

Duration

10-15 minutes

Prerequisites

  • Basic understanding of supply and demand
  • Familiarity with the concept of competition in markets

Activities

  1. Exploration (5 min): Have students drag the marker slowly from left to right, pausing at each labeled market structure. Ask them to note how each characteristic changes and to write down one real-world example for each structure.
  2. Guided Practice (5 min): Assign students a specific industry (e.g., smartphones, local restaurants, tap water) and ask them to place it on the spectrum. Have them justify their placement using the characteristics shown in the panel.
  3. Assessment (5 min): Students answer the question: "Why do consumers generally benefit more from markets closer to perfect competition?" using evidence from the simulation's consumer impact messages and barrier levels.

Assessment

  • Students can correctly identify all four market structures and their key characteristics.
  • Students can place real-world industries at the appropriate point on the spectrum and justify their reasoning.
  • Students can explain the relationship between barriers to entry, number of firms, and pricing power.

References

  1. Market structure - Wikipedia -- Overview of the four main market structures and their characteristics.
  2. Perfect competition - Wikipedia -- Detailed explanation of the conditions required for perfect competition.
  3. Market Structures - Khan Academy -- Video lessons and exercises on imperfect competition and market structures.