Suppose the demand schedule is LaTeX: Q_D\left(p\right)\:=\:40\:-\:\frac{p}{5} Q D ( p ) = 40 − p 5 . Profit maximizing firms have a constant marginal cost of 20. What is the deadweight loss if a price floor of 110 is imposed? (round your answer to one decimal place if necessary)
Q = 40- p/5 ( based on the first sentence that says frac{p}{5})
So p/5 = 40-q
P = 200-5q
Mc = 20
Profit maximising price p= mc
200-5q=20
200-20 =5q
5q= 180
Q =180/5 = 36.
At price floor of p' = 110,
Q' = 40 - 110/5 = 40-22= 18.
Dead weight loss is the surplus lost is the area outlined in green
= 1/2 (110-20)*(36-18)
=0.5*90*18
=810
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