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Difficulty: MediumNecessary vs. Sufficient Condition Flaws

Urban planner: A city's downtown commercial district cannot thrive unless the municipal government invests heavily in public transportation infrastructure. The municipal government of Oakhaven has recently finalized a budget that explicitly allocates massive investment into the city's public transportation network. Therefore, Oakhaven's downtown commercial district will undoubtedly thrive in the coming years.

Which of the following most accurately describes a flaw in the urban planner's reasoning?

  1. treats a condition that is required for a commercial district to thrive as though it were sufficient to guarantee that the district thrivesAnswer
  2. B
    fails to consider that a municipal government might invest heavily in public transportation for reasons entirely unrelated to commercial success
  3. C
    confuses a statistical correlation between public transportation investment and commercial success with a causal relationship
  4. D
    infers that what is true of a city's overall municipal budget must also be true of its individual financial allocations
  5. E
    relies on an ambiguous shift in the meaning of the phrase 'invests heavily' between the premise and the conclusion

Answer

The correct answer is the option stating that the argument treats a condition that is required for a commercial district to thrive as though it were sufficient to guarantee that the district thrives.
The correct answer accurately identifies an illegal reversal. The stimulus uses the word 'unless' to establish that public transportation investment is a necessary requirement for a district to thrive. The author then takes the fact that Oakhaven met this requirement and incorrectly concludes that it is sufficient to guarantee the district will thrive.

Step-by-Step Solution

1
Identify the conditional rule established in the first sentence.
The rule states that a district cannot thrive unless there is heavy investment. Logically: If a district thrives, then there is heavy investment (Thrive -> Investment). Investment is a necessary condition.
Mapping the conditional relationship is required to analyze the argument's structural validity.
2
Identify the specific premise provided about Oakhaven.
Oakhaven has met the necessary condition by allocating massive investment into public transportation.
This establishes what factual information the author is using to draw their conclusion.
3
Evaluate the author's conclusion based on the established rule and premise.
The author concludes that Oakhaven's district will definitely thrive. The logic used is: Investment -> Thrive.
Comparing the conclusion to the original rule reveals any logical discrepancies.
4
Diagnose the logical flaw.
The argument confuses a necessary condition with a sufficient condition. Fulfilling a requirement (investment) does not guarantee the outcome (thriving).
This specific logical error must be matched with the correct abstract description in the answer choices.

Key Concept

Necessary vs. Sufficient Condition Flaws
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Topics

Necessary vs. Sufficient Condition Flaws

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