What term describes the shift in consumption when a price change moves a consumer along an existing indifference curve?
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Answer: C. substitution effect
Explanation
The substitution effect describes consumption changes caused by relative price movements along an indifference curve. When a good's price changes, consumers substitute toward relatively cheaper alternatives while maintaining satisfaction. This movement isolates the pure relative price impact from changes in overall real purchasing power. Indifference curves map combinations of goods that provide consumers with identical levels of utility or satisfaction. A price change alters the slope of the budget constraint, prompting a tangency shift to a new indifference curve point. The total price effect combines both the substitution effect and the separate real income effect.
Demand analysis relies on decomposing price responses into substitution and income effects to understand consumer behavior. Tax policy evaluations use these concepts to determine how excise taxes alter consumer purchasing patterns. Microeconomic models apply substitution principles to labor supply decisions between work and leisure. Option A inferior effect is not a standard economic term used to describe indifference curve movements. Option B normal effect is a non-standard descriptor in consumer choice theory. Option D complementary effect refers to how goods are used together rather than price substitution mechanics.
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