Country X joins an existing customs union, comprising Y and W, which has a common external tariff equal to X's initial tariff. 
After joining the customs union, X imports cars from Y which it previously imported from country V. 
How will this affect the price of cars in country X and the cost of producing the cars imported into country X?
 
            1 )
A
B
3 )
C
4 )
D
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