Practice prompt · Q:economics-and-market-foundations/classify-income-response-001

Classify an income response without ranking the product

Computes income elasticity and confines the normal good label to its population, income definition, range, and evidence posture.

Updated Aug 7, 2026 Review due Nov 7, 2026

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Real income rises from $50,000 to $55,000 and annual service demand rises from 100 to 108 units in a stipulated held-constant segment. Which conclusion is strongest?

Choose the best answer. a Midpoint income elasticity is about +0.8077, supporting a normal-good relationship for this defined segment and range, not a quality ranking, universal label, causal estimate, or complete forecast. b The service is permanently normal and necessary because the coefficient is positive but below one. c Elasticity is 0.0016 because demand rose eight units while income rose $5,000.

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Answer: a

Choice a. (8/104) / (5,000/52,500) = 0.8077; classify only the scoped relationship.