【单选题】Suppose country A had been traditionally enjoying a comparative advantage in the production of good X. As a result most of the large firms manufacturing and exporting good X were concentrated in count...
A.
The number of firms to begin operation in country B must be greater than the number of firms operating in country
B.
The consumers in country B should have a relatively elastic demand compared to the consumers in country
C.
The newfirms in country B should have a higher input-output ratio than the firms operating in country A
D.
The output level of the new firms in country B should be large enough to enable them to enjoy scale economies.