Image talk:Monopoly-surpluses.svg

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This graph is actually incorrect, the MC-curve should cut the Q-axis exactly in the middle between the origin and the point where the demand curve cuts the Q-axis.

This is due to the fact that D is linear:

deriving the turnover (p.Q) to Q results in the MC curve:

D = a + b.Q

Q.D(Q) = a.Q+ b.Q²

MC = a + 2b.Q