The correct option is C. Whose consumption falls when consumers' income rises. Detailed Explanation Understanding Inferior Goods: Inferior goods are a specific category of goods in economics that have a unique relationship with consumer income. The defining characteristic of inferior goods is that their demand decreases as consumer income increases. This is contrary to normal goods, where demand increases with rising income. Why Option C is Correct: - Definition Alignment: Option C accurately describes the behavior of inferior goods. When consumers experience an increase in income, they tend to purchase less of these goods because they can now afford higher-quality alternatives. For example, if a consumer's income rises, they might choose to buy organic food instead of instant noodles, which are considered inferior goods. - Economic Theory: This concept is rooted in the income effect, which states that as income increases, the purchasing power of consumers also increases, leading them to shift their consumption patterns towards more desirable goods. Why the Other Options are Incorrect: - Option A: Whose quality is low - This option suggests that inferior goods are defined by their quality. While it is true that many inferior goods may be perceived as lower quality, this is not a defining characteristic. The key aspect of inferior goods is their demand response to income changes, not their inherent quality.

• Option B: Consumed by very poor people
• This option implies that inferior goods are exclusively consumed by low-income individuals. While it is common for poorer consumers to buy inferior goods due to budget constraints, this does not define the goods themselves. Inferior goods can be consumed by individuals across various income levels, particularly when their income changes. Thus, this option is misleading.
• Option D: Which satisfy only the basic needs
• This option suggests that inferior goods are limited to basic needs. While some inferior goods may fulfill basic needs (like cheap food), the definition of inferior goods is not restricted to this category. Many inferior goods can be non-essential items that people choose when they have lower income. Therefore, this option does not accurately capture the essence of what defines inferior goods.

Common Pitfalls:

• Confusing Inferior Goods with Necessities: Students often confuse inferior goods with necessities. Remember, inferior goods can be non-essential items that people buy when they have lower income.
• Assuming Quality Equals Inferiority: Just because a good is of lower quality does not mean it is an inferior good. The classification is based on consumer behavior in relation to income changes.

Summary for Revision:

• Inferior goods are defined as goods whose consumption decreases when consumer income rises.
• The demand for inferior goods is inversely related to income levels.
• Common examples include low-cost food items or budget brands that consumers may abandon as their financial situation improves.
• Understanding the distinction between inferior goods and normal goods is crucial for grasping consumer behavior in economics.