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The principle of comparative advantage or comparative cos...

The principle of comparative advantage or comparative cost is NOT based on one of the following assumptions

A.

There are restrictions in trade

B.

There are no cost of transportations

C.

There is perfect competition

D.

There are no tariff or import and export quota

E.

There are only two countries and only two commodities entering into international trade

Correct answer is A

No explanation has been provided for this answer.