Interactive Perfect Competition Diagram

Two-panel diagram showing industry market equilibrium and individual firm behaviour side by side. Explore how market price feeds directly into the firm, and how long-run entry and exit drives profit to zero. Built for AQA, Edexcel and OCR A Level Economics.

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Industry MarketIndividual FirmPrice Level (£)Industry Output (Q)2040608010020406080100120D1S1Q*P*Price / Cost (£)Firm Output (q)2040608020406080100120AR=MR=D (P*)MCACq*P*AC*Supernormal profitlearnwithotti.co.uk/diagrams

Demand (D1)

D1 shift+0

D2 shows the effect of a demand shift on P* and the firm's AR=MR line

Supply (S1)

S1 shift+0

S2 shows how a supply shock changes P* for all firms

Market outcome

Industry Q*
50.0
Market P*
£60.0

P* feeds directly into the firm as its horizontal AR=MR line.

Market P* = £60.0. Firm produces q* = 61.8 earning supernormal profit of £1293. Long-run: new firms enter until P = min AC ≈ £31.0.

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