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Difficulty: MediumIncome and Substitution Effects on Demand

When the price of a normal good decreases, the total increase in the quantity demanded by a consumer is driven by both the substitution effect and the income effect. Which statement correctly describes how these two effects operate in response to this price reduction?

  1. Both the substitution effect and the income effect work in the same direction to increase the quantity demanded.Answer
  2. B
    The substitution effect increases the quantity demanded, while the income effect reduces it.
  3. C
    The income effect increases the quantity demanded, while the substitution effect reduces it.
  4. D
    The substitution effect causes a movement along the demand curve, while the income effect shifts the demand curve outwards.

Answer

Both the substitution effect and the income effect reinforce each other in the same direction to increase the quantity demanded of a normal good when its price falls.
When the price of a normal good falls, two distinct phenomena occur: first, the good becomes relatively less expensive than substitute goods, prompting the consumer to substitute into it (substitution effect increases quantity demanded); second, the consumer's real purchasing power rises, and since it is a normal good, higher real purchasing power induces further consumption (income effect increases quantity demanded). Thus, both effects operate in tandem to raise total quantity demanded.

Step-by-Step Solution

1
Analyze the substitution effect of a price reduction.
As the good becomes relatively cheaper compared to other goods, the consumer substitutes toward this good, increasing quantity demanded.
The substitution effect is always negative with respect to price changes (moving in the opposite direction of price).
2
Analyze the income effect of a price reduction for a normal good.
A lower price increases the consumer's real income (purchasing power). Because the good is normal, higher real income leads to increased consumption of the good.
By definition, demand for a normal good moves in the same direction as changes in real income.
3
Combine the two effects to find the net total price effect.
Both effects reinforce each other, resulting in a net increase in total quantity demanded.
Total Price Effect = Substitution Effect + Income Effect.

Key Concept

Directional Alignment of Income and Substitution Effects for Normal Goods
Estimated Time:1m 0s
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Topics

Income and Substitution Effects on Demand

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