Perfect Competition Diagram Maker
Perfect competition answers usually need two linked diagrams: the industry (market supply and demand setting price) and the individual firm (a horizontal P = AR = MR line against MC and ATC). Keeping the price line at exactly the same height across both panels is what examiners look for first.
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With IB EconGraph AI you can generate each panel and keep them in one project, using the horizontal-line template for the firm's demand curve and precise point snapping for the tangency conditions.
What the perfect competition diagram shows
The two-panel perfect competition model shows:
- Industry panel: market S and D determine the equilibrium price P*.
- Firm panel: the firm takes P* as given, a horizontal line labelled P = AR = MR.
- Profit maximisation: output where MC cuts MR from below.
- Short-run abnormal profit/loss: the rectangle between price and ATC at the chosen output.
- Long-run equilibrium: entry/exit shifts industry supply until P = minimum ATC and firms earn normal profit only.
How to draw it in IB EconGraph AI
- Create one graph for the industry (supply & demand template) and one for the firm within the same project.
- In the firm panel, add a horizontal "Price Line" from the Component Library and label it P = AR = MR at the industry price.
- Add MC and ATC bezier curves; profit-maximising output is where MC crosses the price line.
- Shade the profit or loss rectangle between the price line and ATC.
- For the long run, drag ATC until its minimum is tangent to the price line, snapping makes the tangency exact.
IA & exam tips
- Draw the two panels with identical vertical scales so the shared price line reads clearly.
- Short-run loss diagrams (P below ATC but above AVC) are a common discriminator question, keep an AVC curve handy in a saved template.
- In "evaluate whether perfect competition is efficient" essays, mark both allocative (P = MC) and productive (min ATC) efficiency points on the firm diagram.
Frequently asked questions
Can I draw the firm and industry side by side?
Each graph is one canvas, but projects keep the two panels together, and consistent export sizes make them easy to place side by side in a document.
How do I make ATC tangent to the price line?
Use point snapping, drag the ATC minimum onto the price line and the editor snaps the tangency point precisely.
Does the AI know P = AR = MR?
Yes, asking for "perfectly competitive firm in long-run equilibrium" produces the horizontal price line tangent to minimum ATC.
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