Answer:
The correct answer is increased competition.
Explanation:
In the first scenario, Diamonique has local market power because there is no external competition. This way you can raise prices far above your costs. However, in the second scenario, by implementing free trade, Dominique has competition from foreign products, since free trade enables competition between domestic and foreign production, culminating in lower prices. Thus Dominique can no longer raise its prices due to competition made possible by free trade.