Answer:
Step-by-step explanation:
a) Consumers in Portland will gain from an increase in the varieties of beer available through importing. Additionally, prices will fall due to the increased competition.
b) By selling abroad, the producers in Portland will be able to lower their average costs through increasing returns to scale. However, they will face greater competition in their local market due to new varieties available from the import of beer from Aleland. As a result of the competition from Aleland, consumer demand for their variety decreases, thus driving their prices down.