Which among the following regarding the nature of goods and income elasticity are correctly matched? Nature of Goods Income Elasticity 1. Necessity : Between 0 and 1 2. Luxury : More than 1 3. Inferior : More than 0 Select the answer using the code given below.

1. The Law of Demand and Consumer Income (basic)

Welcome to your first step in mastering Demand Theory! To understand how markets work, we must first define Demand. In economics, demand is more than just a desire for a product; it is the quantity of a commodity that a consumer is both willing to buy and able to afford, given the prevailing prices and the consumer's income Microeconomics (NCERT class XII 2025 ed.), Theory of Consumer Behaviour, p.10. While we often focus on how price affects demand, Consumer Income is the engine that determines the 'ability to afford' part of that definition. When your income changes, your purchasing patterns shift. Economists categorize goods based on how your demand for them responds to a change in your income. For most items, which we call Normal Goods, an increase in income leads to an increase in demand. However, there are Inferior Goods where the relationship is inverted: as you get richer, you actually buy less of them Microeconomics (NCERT class XII 2025 ed.), Theory of Consumer Behaviour, p.24. For example, a student might stop buying instant noodles (an inferior good) and start buying fresh meals (a normal good) once they land a high-paying job.

Type of Good	Impact of Income Increase	Impact of Income Decrease
Normal Good	Demand Increases (Shift Right)	Demand Decreases (Shift Left)
Inferior Good	Demand Decreases (Shift Left)	Demand Increases (Shift Right)

It is crucial to distinguish between moving along a demand curve and a shift of the curve. A change in the price of the good itself causes a movement along the curve. However, a change in consumer income causes the entire demand curve to shift Microeconomics (NCERT class XII 2025 ed.), Theory of Consumer Behaviour, p.26. This is because, at the same price, you are now willing and able to buy a different quantity than before.

Sources: Microeconomics (NCERT class XII 2025 ed.), Theory of Consumer Behaviour, p.10; Microeconomics (NCERT class XII 2025 ed.), Theory of Consumer Behaviour, p.24; Microeconomics (NCERT class XII 2025 ed.), Theory of Consumer Behaviour, p.26

2. Understanding Elasticity of Demand (basic)

Concept: Understanding Elasticity of Demand

3. Normal Goods vs. Inferior Goods (intermediate)

In our study of demand, we often focus on how price affects our choices. However, our income is an equally powerful driver. Economists distinguish between goods based on how our demand for them responds to a change in our purchasing power. A Normal Good is one where the demand increases as the consumer's income rises, and decreases when income falls. In other words, demand moves in the same direction as income Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p. 24.

Within the category of normal goods, we see two distinct behaviors based on Income Elasticity of Demand (YED). If your demand for a good increases but at a slower rate than your income growth (0 < YED < 1), we call it a necessity (like salt or basic clothing). If your demand grows much faster than your income (YED > 1), it is classified as a luxury good (like designer watches or fine dining) Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p. 29.

Conversely, Inferior Goods behave quite differently. For these goods, demand moves in the opposite direction of income. As you get richer, you actually buy less of them because you can now afford superior substitutes. A classic example is coarse cereals or low-quality food items. When a consumer's income is very low, they may rely on these items, but as their income crosses a certain threshold, they switch to better quality grains, causing the demand for the "inferior" item to drop Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p. 25.

Feature	Normal Goods	Inferior Goods
Income vs. Demand	Direct relationship (Move together)	Inverse relationship (Move opposite)
Income Elasticity (YED)	Positive (YED > 0)	Negative (YED < 0)
Examples	Organic vegetables, Smartphones	Coarse grains, Public transport (for some)

Sources: Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.24; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.25; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.29

4. Exceptions to Law of Demand: Giffen and Veblen Goods (intermediate)

In our journey through demand theory, we have seen that consumers usually buy less when prices rise. However, the world of economics has its "rebels"—goods that defy the Law of Demand. These exceptions occur when the price and quantity demanded move in the same direction, resulting in an upward-sloping demand curve. The two most prominent examples are Giffen Goods and Veblen Goods.

Giffen Goods are a highly specific type of inferior good where the demand increases as the price increases. This happens because of a unique tug-of-war between two forces: the substitution effect and the income effect. Normally, if the price of a good rises, you substitute it with something cheaper. However, for a Giffen good, the consumer is so poor and the good is such a basic staple (like coarse cereals) that a price rise significantly reduces their "real income" or purchasing power. This negative income effect is so strong that it outweighs the substitution effect; the consumer can no longer afford any "superior" food items and is forced to buy even more of the basic staple to survive Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.24.

On the opposite end of the spectrum are Veblen Goods, named after the economist Thorstein Veblen. These are luxury items consumed for status or "conspicuous consumption." For these goods, a higher price tag actually makes the product more desirable because it serves as a symbol of wealth and prestige. Think of limited-edition luxury watches, designer handbags, or rare diamonds. If the price of these items were to drop significantly, they might lose their "snob appeal," and the wealthy might actually demand less of them.

Feature	Giffen Goods	Veblen Goods
Nature	Low-quality staple/inferior items.	High-status luxury items.
Driver	Extreme poverty and lack of substitutes.	Social status and "conspicuous consumption."
Income Effect	Strong negative income effect outweighs substitution.	Linked to high purchasing power.
Example	Coarse cereals or bread during a famine.	Vintage wine or luxury sports cars.

Sources: Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.24-25

5. Engel's Law and Consumption Patterns (intermediate)

In our journey through demand theory, we now encounter a pivotal concept that explains how our shopping baskets change as we get richer: Income Elasticity of Demand (YED). While price is a major factor, our level of income often dictates the type of goods we prioritize. To understand this, we look at the work of Ernst Engel, a 19th-century statistician who observed a consistent pattern in household budgets, now known as Engel's Law.

Engel's Law states that as a consumer's income increases, the proportion (percentage) of income spent on food decreases, even if the absolute amount spent on food actually rises. This happens because food is a fundamental necessity; once you have enough to eat, you don't keep buying more food at the same rate your salary grows. Instead, you shift your extra spending toward comforts and luxuries. This relationship is a core part of how we classify goods based on their Income Elasticity of Demand, which measures how demand responds to income changes Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 24.

Economists categorize goods into three main buckets based on this responsiveness:

Category of Good	Income Elasticity (YED)	Consumer Behavior
Necessities	0 < YED < 1	Demand increases less than proportionately to income. (e.g., salt, basic clothing).
Luxuries	YED > 1	Demand increases more than proportionately to income. (e.g., high-end electronics, leisure travel).
Inferior Goods	YED < 0 (Negative)	Demand actually falls as income rises because consumers switch to better quality alternatives (e.g., coarse cereals or low-quality public transport) Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 24.

Understanding these patterns is vital for the UPSC syllabus because it helps us predict how consumption shifts in a growing economy like India. When national income rises, we expect the demand for luxury services (like telecommunications and aviation) to boom, while the relative importance of basic agriculture in the consumer's total budget begins to shrink Indian Economy, Nitin Singhania (ed 2nd 2021-22), Chapter 1, p. 2.

Sources: Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.24; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Chapter 1: National Income, p.2

6. Measuring Income Elasticity (YED) Coefficients (exam-level)

In our previous discussions, we looked at how price affects demand. Now, we turn to another critical factor: Income. The Income Elasticity of Demand (YED) measures the degree of responsiveness of the quantity demanded for a good to a change in the consumer's income. It is calculated as the percentage change in quantity demanded divided by the percentage change in income. Unlike price elasticity, where we often ignore the negative sign, the sign (+ or -) of the YED coefficient is the primary tool used by economists to classify goods. Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 34 To master this concept for the exam, you must remember three distinct ranges for the YED coefficient:

• YED > 1 (Income Elastic): These are Luxury Goods. When your income rises, your demand for these items increases more than proportionately. For example, if a 10% rise in income leads to a 20% rise in the demand for international travel, the YED is 2.0.
• 0 < YED < 1 (Income Inelastic): These are Necessities. As income grows, we buy more of them, but the increase is less than proportionate. You might buy slightly better quality food if your salary doubles, but you won't double your salt intake. Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 29
• YED < 0 (Negative): These are Inferior Goods. Here, income and demand move in opposite directions. As people get wealthier, they move away from low-quality substitutes (like coarse cereals) toward superior alternatives. Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 24

Comparison of YED Coefficients

Coefficient Value	Classification	Consumer Behavior
Negative (e.g., -0.5)	Inferior Good	Demand falls as income rises.
Between 0 and 1	Normal Good (Necessity)	Demand rises slower than income.
Greater than 1	Normal Good (Luxury)	Demand rises faster than income.

Sources: Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.34; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.29; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.24

7. Categorizing Goods by Income Elasticity Ranges (exam-level)

In economics, understanding how a consumer's demand shifts as their income grows is vital for predicting market trends. This relationship is captured by the Income Elasticity of Demand (YED). While price elasticity tells us how we react to a price tag, income elasticity tells us how we react to a raise. By looking at the numerical value of YED, we can categorize goods into three distinct buckets: Necessities, Luxuries, and Inferior Goods.

For most goods, as you get richer, you buy more; these are called Normal Goods. Within this category, we distinguish between necessities and luxuries based on the proportion of change. If your income doubles but you only buy 10% more salt, that good is a Necessity (Income-inelastic, 0 < YED < 1). However, if your income rises by 10% and you suddenly spend 50% more on international vacations, those are Luxuries (Income-elastic, YED > 1) Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p.29. Essentially, luxuries are highly responsive to your wealth, while necessities are essential items you buy regardless of minor income fluctuations Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p.31.

Conversely, there are goods we actually buy less of as we get wealthier. These are Inferior Goods, which have a negative income elasticity (YED < 0). As a consumer's purchasing power rises, they often switch from low-quality staples (like coarse cereals) to higher-quality alternatives Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p.24. Therefore, a negative sign in your elasticity calculation is a clear signal that the good is considered "inferior" in the eyes of that consumer.

YED Range	Category of Good	Description
YED < 0	Inferior Good	Demand falls as income rises (e.g., local bus transport vs. owning a car).
0 < YED < 1	Normal Good (Necessity)	Demand rises, but slower than income (e.g., basic groceries).
YED > 1	Normal Good (Luxury)	Demand rises much faster than income (e.g., designer clothing).

Sources: Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.24; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.29; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.31

8. Solving the Original PYQ (exam-level)

You have just mastered the fundamental relationship between a consumer's purchasing power and their demand patterns. This question tests your ability to apply the Income Elasticity of Demand (YED) formula, which quantifies how the quantity demanded of a good shifts when income levels change. As we discussed in the building blocks, the core distinction lies in whether a good is "Normal" (positive elasticity) or "Inferior" (negative elasticity). Within normal goods, the classification further depends on how sensitive the demand is to those income fluctuations. According to Microeconomics (NCERT class XII 2025 ed.), understanding these thresholds is key to identifying the nature of the product.

To arrive at the correct answer, walk through the logic for each statement. For Necessities, demand increases as you get richer, but only up to a point; for instance, you won't buy ten times more salt just because your salary doubled. Thus, the elasticity is positive but inelastic (between 0 and 1), making Statement 1 correct. For Luxury goods, demand accelerates faster than income growth—meaning as you earn more, you spend a disproportionately larger share on these items—resulting in an elasticity greater than 1, which confirms Statement 2. However, for Inferior Goods, the relationship is inverse: as you earn more, you discard low-quality items for better substitutes. This means the elasticity must be negative (less than 0), making Statement 3 mathematically incorrect.

The common trap in this UPSC question is the phrasing of Statement 3. UPSC often uses "More than 0" to see if you can distinguish between positive direction and negative direction. Since Statement 3 is false, you can use the process of elimination to discard options (A), (B), and (D). Many students confuse "Inelastic" (low positive) with "Inferior" (negative); by remembering that inferior goods always have a negative income effect, you can confidently arrive at the correct answer (C). Always look for the sign (plus or minus) before looking at the magnitude of the number.