# Answer to Question #44840 in Finance for Mohseen Khan

Question #44840
Consider a small country in which the demand and supply curves of a particular commodity are respectively given as: Qd=120-20P (1) Qs=20P (2) where Qd is the quantity demanded, Qs the quantity supplied, and P the price. (a) compute the equilibrium price and quantity under conditions of autarky and the elasticity of demand (Ed ) and supply (Es ) at the point of equilibrium. (b) Suppose now that the country decides to engage in trade for this particular commodity and the international price Pw=1. Compute Qd , Qs, imports (M), Ed , Es , and the changes in consumers’ surplus, producers’ surplus and in total welfare. Discuss your answer. (c) Lets assume that the country imposes a tariff t =1 per unit. Compute Qd , Qs , M, Ed , Es , and the changes in consumers’ surplus, producers’ surplus, total welfare and in tariff revenue (TR) and compare the results with free trade case.
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2014-11-17T12:43:30-0500
Qd = 120 - 20P, P = 6 - Q/20
Qs = 20P, P = Q/20
(a) The equilibrium price and quantity under conditions of autarky will be in the point, where Qd = Qs
120 - 20P = 20P
40P = 120
Pe = \$3
Qe = 20*3 = 60 units.
The elasticity of demand (Ed) = Pd&#039; = 1/20 and supply Es = Ps&#039; = 1/20 too at the point of equilibrium.
(b) If now the international price is Pw = \$1. Qd = 120 - 20*1 = 100 units, Qs = 20*1 = 20 units, imports (M) = 120 - 20 = 100, Ed = 1/20, Es = 1/20, the consumers&rsquo; surplus will increase, producers&rsquo; surplus will decrease and total welfare will increase.
(c) If the country imposes a tariff t =\$1 per unit. Qd = 120 - 20*2 = 80 units, Qs = 20*2 = 40 units, M = 80 - 40 = 40 units, Ed = 1/20, Es = 1/20, consumers&rsquo; surplus will decrease, producers&rsquo; surplus will increase, total welfare will decrease, tariff revenue (TR) will increase.

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