Finance and the Economy · Seminar 3 · Elasticity

Surplus before and after a demand shift

Demand for Beautiful World shifts from D₁ to D₂ after the reunion tours. Click each part of the question to shade the area it asks for, then shift demand and steepen supply to see who gains. Question 7, from Introduction to Economics (Osadiya, ch. 9).

Click a part of the question to highlight its area. Then move the sliders: the letters follow the curves.
nonelarge
elastic (flat)inelastic (steep)

Consumer surplus

Producer surplus

Equilibrium

Who gains? Steepen the supply curve and the same demand shift pushes price up more and quantity up less. Producer surplus climbs steadily; the gain in consumer surplus shrinks towards nothing as supply becomes perfectly inelastic, because buyers then pay more for the same quantity.

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