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Difficulty: MediumConcept and Law of Demand

During a period of severe economic downturn, a low-income household observes that when the price of cassava flour—their primary staple food—rises, their monthly consumption of cassava flour actually increases because they can no longer afford meat or rice. Which economic concept accounts for this exception to the standard law of demand?

  1. Giffen good behavior, where the negative income effect of a price rise in a staple good overrides the substitution effectAnswer
  2. B
    A shift in demand, where an increase in the commodity price directly shifts the market demand curve to the right
  3. C
    Joint demand effect, where cassava flour and rice are consumed together in fixed proportion as complementary goods
  4. D
    Veblen effect, where consumers purchase greater quantities of a commodity strictly to showcase luxury and social status

Answer

Giffen good behavior explains this phenomenon because the income effect of a price rise in an essential inferior staple outweighs the substitution effect, leading to an upward-sloping demand relationship.
The scenario describes a classic Giffen good situation. For a low-income consumer, cassava flour is a staple inferior good. When its price increases, the consumer's real income declines sharply. Because they can no longer afford premium foods like meat or rice, they substitute away from those expensive items toward buying more cassava flour to survive, making the income effect override the substitution effect.

Step-by-Step Solution

1
Identify the relationship between price and quantity demanded described in the scenario
As the price of cassava flour rises, the quantity demanded increases, demonstrating an upward-sloping demand curve.
This scenario presents an inverse of the normal law of demand, which states that price and quantity demanded are inversely related.
2
Analyze the economic nature of the product and consumer background
Cassava flour is a basic staple food consumed by low-income households who spend a large portion of their budget on it.
When the price of such a staple rises, the household's real purchasing power falls significantly (negative income effect), forcing them to cut back on expensive foods (like meat and rice) and buy more of the cheap staple.
3
Distinguish between types of demand exceptions
This phenomenon is classified as a Giffen good, whereas luxury/prestige goods fall under the Veblen effect.
Giffen goods apply to inferior staple foods for low-income consumers, satisfying the specific conditions described.

Key Concept

Exceptions to the Law of Demand (Giffen Goods)
Estimated Time:1m 15s
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Topics

Concept and Law of Demand

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