Based on the demand and supply curves, the price, and the units bought and sold, the producer surplus would be $18.
This can be calculated as:
= Area of producer surplus
= (Length x Width) + 0.5 x (Base x Height)
Solving gives:
= ( 6 x ( 4 - 2)) + (0.5 x ( 6 x 2))
= 12 + 6
= $18
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