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Zorluk: ZorNecessary Assumption

Environmental Economist: Over the past five years, the municipality of Ardenville replaced flat-rate residential electricity tariffs with a dynamic time-of-use pricing structure, under which peak-hour electricity rates quadrupled while off-peak rates were discounted. Municipal records show that overall peak-hour residential electricity demand declined by 18 percent over this period. Critics argue that this reduction was merely an artifact of milder summer temperatures rather than behavioral shifts. However, during these same five years, neighboring municipalities with identical weather patterns and standard flat-rate pricing experienced a 4 percent increase in peak-hour residential electricity consumption. Therefore, Ardenville's dynamic pricing policy was indeed effective in motivating residents to shift their discretionary electricity usage to off-peak hours.

Which of the following are unstated assumptions on which the environmental economist's argument depends? Select all that apply.

  1. The reduction in Ardenville's peak-hour electricity consumption was not achieved entirely through the permanent elimination of discretionary energy use rather than its rescheduling.Cevap
  2. B
    Dynamic time-of-use pricing is the most cost-effective policy mechanism available to municipal governments for reducing peak-load grid strain.
  3. The decline in peak-hour residential electricity consumption in Ardenville was not primarily attributable to a net decrease in the municipality's residential population over the five-year period.Cevap
  4. D
    Ardenville residents who curtailed their peak-hour electricity consumption did so exclusively because of financial considerations rather than environmental awareness.
  5. E
    If the neighboring municipalities adopt Ardenville's time-of-use tariff structure, their peak-hour residential electricity consumption will necessarily decrease by at least 18 percent.

Cevap

The argument depends on the assumption that the reduction was not achieved entirely through permanent elimination of energy use rather than rescheduling, and the assumption that the decline was not primarily attributable to a net decrease in residential population.
Both required assumptions must be true for the conclusion to hold. The statement ensuring that the reduction was not achieved entirely through permanent elimination of discretionary energy use is a supporter assumption that validates the conclusion's specific claim of usage being shifted to off-peak hours rather than abandoned altogether. The statement ensuring that the decline was not primarily driven by a drop in residential population is a defender assumption that protects the causal link between the pricing policy and the aggregate demand reduction.

Adım Adım Çözüm

1
Isolate the argument's premises and main conclusion.
Premises: Ardenville's peak electricity demand dropped 18% after implementing dynamic pricing; neighboring cities with identical weather but flat rates saw a 4% increase. Conclusion: Dynamic pricing was effective in motivating residents to shift discretionary electricity usage to off-peak hours.
Identifying the exact scope of the conclusion is necessary to determine what unstated premises are logically required.
2
Identify structural gaps between the evidence and the specific claim in the conclusion.
Gap 1 (Supporter): The evidence shows a reduction in peak-hour usage, but the conclusion specifically asserts a 'shift' of usage to off-peak hours. Gap 2 (Defender): The evidence assumes the 18% drop represents per-capita behavioral changes rather than demographic decline or population loss.
Necessary assumptions must bridge conceptual leaps or defend against alternative causal explanations.
3
Apply the Negation Test to candidate statements.
Negating the statement regarding permanent elimination means all peak-hour reductions were pure curtailments with zero shift to off-peak hours, directly destroying the conclusion. Negating the population statement means the reduction was merely an artifact of population shrinkage, destroying the causal link to the policy.
A statement is a necessary assumption if and only if its logical negation fatally undermines the argument.

Anahtar Kavram

Necessary Assumption in Logical Reasoning
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Necessary Assumption

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