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Problem 4 (5 pts}. In the course, we have discussed different trade models and aspects of trade. In this problem, you should compare [i] the Ricardian model, (ii) external economies of scale, and (iii) internal economies of scalefmonopolistic competition. a} Compare the main results of the three models. 5-10 sentences are expected. (2 pts} b} In each of the models, what is the main reason why consumers benet from trade? 4-3 sentences are expected. {2 pts) c} For each of the three models, name one real-world trade pattern that can be explained with the model. 4-3 sentences are expected. {1 pt)