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Difficulty: HardRuling Out Alternate Explanations (Defender)

During the late nineteenth century, the rapid integration of mechanized looms in the textile mills of the Solway region was immediately followed by a sharp decline in the number of itinerant weavers seeking contract work there. Economic historians have concluded that the operational efficiency of the mechanized looms eliminated the demand for manual weaving, directly causing the itinerant workforce to abandon the region.

Evaluate the logical requirements of the historians' conclusion.

Statement: The argument fundamentally relies on the assumption that a severe shortage of raw materials did not force the Solway textile mills to drastically reduce their overall operations during that same period.

Is the statement above true or false?

Answer: Answer

Answer

True
The statement is true because the argument asserts a causal relationship: mechanization caused the drop in itinerant weavers. For this causal claim to hold, we must rule out alternate explanations for the weavers' departure. If a raw material shortage drastically reduced mill operations, there would be no work for the weavers regardless of mechanization. By negating the assumption (assuming the shortage did happen), the alternate cause explains the drop in weavers, destroying the original causal claim. Therefore, assuming the shortage did NOT happen is necessary.

Step-by-Step Solution

1
Identify the conclusion and the supporting evidence in the argument.
Conclusion: The operational efficiency of the mechanized looms caused the itinerant workforce to abandon the region. Evidence: The introduction of mechanized looms immediately preceded the sharp decline in itinerant weavers.
Deconstructing the argument is necessary to expose the core causal relationship being claimed by the author.
2
Categorize the reasoning gap present in the stimulus.
The argument assumes that a chronological correlation implies exclusive causation, failing to structurally account for other potential reasons the weavers might have left at that exact time.
Identifying the causal gap determines what type of assumption is needed to defend the argument against alternative explanations.
3
Apply the Negation Test to the candidate statement.
Negated statement: A severe shortage of raw materials DID force the Solway textile mills to drastically reduce their overall operations during that same period.
The Negation Test definitively proves whether an assumption is strictly necessary for the conclusion to survive.
4
Evaluate the impact of the negated statement on the core conclusion.
The negated statement provides a robust alternative explanation for the weavers' departure (lack of materials meaning lack of work), completely severing the original claim that the mechanized looms were the cause.
If negating the assumption destroys the argument, the original statement is a logically necessary defender assumption, making the evaluation 'True'.

Key Concept

Ruling Out Alternate Explanations (Defender Assumptions)
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Ruling Out Alternate Explanations (Defender)

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