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Price Mechanism Feedback Loop

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About This MicroSim

This MicroSim illustrates how the price mechanism acts as a self-correcting feedback loop that guides markets toward equilibrium. Students can watch an animated sequence showing two paths: the shortage correction path (price below equilibrium leads to shortages, which push prices up) and the surplus correction path (price above equilibrium leads to unsold inventory, which pushes prices down). Both paths converge at the equilibrium star in the center, reinforcing the concept that free markets tend to self-correct.

How to Use

  1. Select a path from the dropdown: choose "Shortage Correction" or "Surplus Correction" to see different adjustment processes.
  2. Click "Animate" to start the step-by-step animation showing how the market moves from disequilibrium to equilibrium.
  3. Hover over each node to read a detailed description of what happens at that stage of the adjustment process.
  4. Toggle "Auto-loop" to automatically alternate between shortage and surplus correction paths after each animation completes.
  5. Click "Reset" to stop the animation and return to the starting state.

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/price-mechanism-loop/main.html"
        height="562px"
        width="100%"
        scrolling="no"></iframe>

Lesson Plan

Grade Level

9-12 (High School Economics)

Duration

10-15 minutes

Prerequisites

  • Understanding of supply, demand, and equilibrium
  • Knowledge of what surpluses and shortages are

Activities

  1. Exploration (5 min): Watch the shortage correction animation. Then switch to surplus correction and watch that animation. What are the similarities and differences between the two paths?
  2. Guided Practice (5 min): For each of these scenarios, predict which path the market would follow: (a) a popular new video game is priced too low at launch, (b) a store orders too many winter coats. Verify by selecting the matching path and watching the animation.
  3. Assessment (5 min): Draw your own feedback loop diagram on paper for the following scenario: a sudden frost destroys half the orange crop, causing a shortage. Label each step and explain how the market eventually reaches a new equilibrium.

Assessment

  • Students can describe the steps in both the shortage and surplus correction processes
  • Students can explain why free markets tend to self-correct toward equilibrium
  • Students can apply the price mechanism concept to real-world scenarios

References

  1. Price mechanism - Wikipedia - Overview of how prices coordinate economic activity and allocate resources.
  2. Invisible hand - Wikipedia - Adam Smith's concept of self-regulating markets through price signals.
  3. Market Equilibrium and Disequilibrium - Khan Academy - Video lessons on how markets adjust to reach equilibrium.