international trade question?

Quantity demanded Qd = 10 + 2p , quantity supplied : Qs = 60 - 0.5p . They intercept at p = 20$/ton, Qd=Qs = 50. a) Assume that imports are available at price = 10. Find the equilibrium price and quantittes. b) Assume that exports are also available. The state taxes 16$/ton on imports and subsidizes 16$/tn the exports. Find the new equilibrium price and quantities.

My solution

a)For p =10 , Qs = 10 + 2*10 = 30 and Qd = 60 - 0.5*10=55 so there is a domestic shortage of 55-30 that must be covered with imports. So imports are 55-30 = 25. So equilibrium price = 10 and equilibrium quantity produced domestically is 30

b) Subsidy of 16 means that domestic price (20$/ton) falls to 4$/ton while tax on imports means that world price (p=10$/ton) is seen domestically as 26$/tn. So domestic demand is Qd = 60 - 0.5*4 = 58 and domestic supply is Qs = 10+2*4 = 18 so there are 58-18=40 of imports.

So newequilibrium price is 4 and equilibrfium domestic quantity produced is 18.

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