A market structure in which one firm makes up the entire market is:

Economies of scale may be a barrier to entry in a situation in which

A) only small-scale production can lower the per-unit cost of production. B) only small-scale production can meet the constantly changing market demand. C) only large-scale production can lower the per-unit cost of production. D) large-scale production is inefficient.

Using the data in the above table, and assuming constant opportunity costs, it is likely that

A) the United States will import food. B) Mexico will export cloth. C) the United States will export both cloth and food. D) Mexico will export both cloth and food.