The demand for wheat is given by: QD= 137.5 -0.25P. The supply of wheat is given by: QS= 10P -170. Suppose the government imposes a price ceiling of $25. Calculate the dollar amount of consumer surplus with the price ceiling.
After consumer surplus, the equilibrium quantity is Qs at the price ceiling
Qs=10P-170
P=25
Qs=10*25-170
Qs=80
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the maximum willingness to pay of consumer at that quantity is
Q=137.5-0.25P
80=137.5-0.25P
0.25P=57.5
P=230
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converting the demand curve to the inverse demand curve
Q=137.5-0.25P
0.25P=137.5-Q
P=550-4Q
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consumer surplus =0.5*( Y-axis intercept of the demand curve - maximum willingness to pay at the price ceiling equilibrium)*Qs+( maximum willingness to pay at the price ceiling equilibrium - price ceiling )*Qs
=0.5*(550-230)*80+(230-25)*80
=29200
the consumer surplus is $29200
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