n the presence of external economies of scale in a good production, free trade may leave country A worse off than it would be in the absence of trade A. when country A imports the good from country B at a price that blocks entry by country A producers, which would be able to supply country A market at a lower price under autarchy B. when country A exports the good to country B at a price that blocks entry by country B producers, which would be able to supply country B market at a lower price under autarchy C. when country A imports the good from country B at a price that blocks entry by country A producers, which would be able to supply country A market at a higher price D. when the average production cost in country A is lower than the average production cost in country B