When Ozland closes off to trade, it notices that the number of firms in an industry double in size. What economic theory would help us explain this phenomenon? Stolper-Samuelson. Melitz. Ricardian. Cournot.

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Chapter1: Making Economics Decisions
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When Ozland closes off to trade, it notices that the number of firms in an industry double in size. What economic theory would help us explain this phenomenon?

  1. Stolper-Samuelson.
  2. Melitz.
  3. Ricardian.
  4. Cournot.

please explain answer and a diagram 

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Why can't the answer be the Ricardian economic theory? The theories are very similar but what differentiates the two regarding this scenario?

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