Passage Summary: An economist argues that trying to fix an economy by cutting imports is useless because a trade deficit is just a sign of a problem, not the problem itself—kind of like how cooling a thermometer won't cure a sick person.

Conclusion: Restricting imports is an ineffective way to strengthen an economy despite a trade deficit.

Reasoning: A trade deficit is a symptom of economic issues, not the cause, much like a high temperature is a symptom of a fever.

Analysis: The economist uses a vivid analogy to illustrate the relationship between a symptom and its underlying cause. By comparing a trade deficit to a thermometer reading, the author highlights the futility of treating a 'sign' rather than the 'disease.' When identifying the method of reasoning, focus on the structural use of this comparison to argue that a specific policy addresses a symptom rather than a cause. The argument relies on the reader accepting that the two scenarios are functionally identical in their logic.