Explain the relationship between total utility and marginal utility. OR Distinguish between normal Good and in

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Q. Explain the relationship between total utility and marginal utility.

(OR)

Distinguish between normal Good and inferior Good.

Jammu Kashmir JkboseJKBOSE Class 12 Annual Regular Examination (Commerce) 2025Subjective· 4mImportance★★★★★

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Concept understanding — Normal Good Definition

Normal Good: The Everyday Economics of "More Money, More Stuff"

Think about what happens when your pocket money goes up. You might buy a better phone, eat out more often, or upgrade your backpack. That instinct — "I have more income, so I buy more of this" — is the entire intuition behind a normal good.

The Precise Meaning

A normal good is any good or service for which demand increases when consumer income rises, and decreases when income falls — all other factors remaining constant.

That last part is crucial. We're isolating the effect of income alone. If your income doubles but the price of pizza also doubles, you might not buy more pizza. That's a different story. For a normal good, we hold prices, tastes, and everything else fixed, and only change income.

Important

The relationship between income and quantity demanded for a normal good is positive — they move in the same direction.

Why It Matters: The Income Elasticity Connection

This is where the concept becomes a tool, not just a label. Economists measure how strongly a good responds to income changes using income elasticity of demand. The NCERT textbook defines it as:

E_Y = \frac{\text{Percentage change in quantity demanded}}{\text{Percentage change in income}}

For a normal good, $E_Y > 0$ . That's the mathematical signature.

But within normal goods, there's a split that matters for exams and real life:

Type	Income Elasticity	Example	What Happens When Income Rises
Necessity	$0 < E_Y < 1$	Rice, basic clothing, bus travel	Demand rises, but less than proportionately. You don't buy twice as much rice when your income doubles.
Luxury	$E_Y > 1$	Designer watches, international travel, restaurant meals	Demand rises more than proportionately. A 10% income jump might lead to a 20% increase in fine dining.

Note

NCERT Class-12 Macroeconomics (Chapter 2, National Income Accounting) doesn't derive this formula explicitly, but the concept appears in the context of consumption functions and the marginal propensity to consume. The elasticity formula above is from Microeconomics (Class-12, Chapter 2, Theory of Consumer Behaviour).

The Diagram (Describe It in Words)

Picture a graph with Income on the horizontal axis and Quantity Demanded on the vertical axis. For a normal good, the curve slopes upward from left to right. It's called an Engel curve.

For a necessity, the curve rises but flattens out — you need only so much wheat.
For a luxury, the curve gets steeper as income grows — the richer you get, the faster you spend on premium goods.

What a Normal Good Is NOT …

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Answering BOTH alternatives printed on the paper.

Main question — Relationship between Total Utility (TU) and Marginal Utility (MU):

Marginal Utility is the addition to Total Utility from consuming one more unit of a commodity (MUn = TUn − TUn-1). Their relationship:

As long as MU is positive (though diminishing, by the Law of Diminishing Marginal Utility), TU continues to increase, but at a decreasing rate.
TU reaches its maximum at the point where MU becomes zero (point of satiety) — this is the point of maximum satisfaction.
If consumption is pushed further and MU becomes negative, TU starts to fall. So graphically, TU is an inverted-U shaped curve, while MU is a downward-sloping curve that cuts the X-axis exactly where TU is at its peak.

OR — Distinguish between Normal Good and Inferior Good:

Basis	Normal Good	Inferior Good
Effect of rise in income	Demand increases	Demand decreases (beyond a certain income level)
Effect of fall in income	Demand decreases	Demand increases

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2026Set ANNUAL1 mark
$Q. Fill in the blank: For inferior goods the demand curve shifts ________.$
›Reveal solutionSolution

For an inferior good, a rise in income shifts the demand curve leftward.

An inferior good has a negative income effect: as the consumer's income rises, the demand for it falls (people switch to superior substitutes). A fall in demand at every price is shown by a leftward (backward) shift of the demand curve. (For a normal good, a rise in income would sh …

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CBSE 2025Set ANNUAL1 markMCQ
$Q. For normal goods, Law of Demand states the ............ relationship between price of goods and quantity of goods. (A) Direct (B) Positive (C) Inverse (D) None of these$
›Reveal solutionSolution

For normal goods the Law of Demand shows an inverse relationship between price and quantity demanded, so the answer is (C).

The Law of Demand says that, holding other factors constant (ceteris paribus), a rise in the price of a normal good reduces its quantity demanded and a fall in price increases it. Thus price and quantity demanded move in opposite directions — an inverse (negative) relationship — which is why the demand curve slopes downwar …

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CBSE 2025Set ANNUAL1 markMCQ
$Q. There is an inverse relation between income of the consumer and demand for a commodity such good is called ______ .$
(a) Normal Good
(b) Inferior good
(c) Substitute good
(d) Complementary good
›Reveal solutionSolution
An inverse relationship between income and demand defines an inferior good, not a normal good.

Goods are classified by how demand responds to a change in the consumer's income, keeping price and other factors constant:

Normal good: demand moves in the SAME direction as income — as income rises, demand rises (e.g., branded clothing, better quality food).

Inferior good: demand moves in the OPPOSITE direction to income — as income rises, the consumer buys LESS of it and switches to a superior substitute (e.g., a consumer buying less coarse grain and more fine rice as income rises). …
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CBSE 2024Set MARCH1 markMCQ
$Q. The demand curve of normal goods shifts rightward, when$
(a) Income increases
(b) Population increases
(c) Taste and preference increases
(d) All of the above
›Reveal solutionSolution

A rise in income, a larger population, or stronger taste all shift a normal good's demand curve rightward — so the answer is 'All of the above' (Kerala Plus Two/DHSE economics).

…

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CBSE 2024Set ANNUAL1 markMCQ
$Q. With an increase in income consumer decreases the consumption of which goods? (A) Normal goods (B) Inferior goods (C) Giffen goods (D) Both (A) and (B)$
›Reveal solutionSolution

As income rises, demand for inferior goods falls, so the answer is (B).

In the BSEB Inter Class-12 Economics syllabus, goods are classified by how their demand responds to income. For a normal good, demand rises with income (positive income elasticity). For an inferior good, demand falls as income rises, because the consumer shifts to superior substitutes (for example, moving from coarse …

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CBSE 2023Set MARCH1 markMCQ
$Q. If consumer's income increases, the demand for inferior goods$
(a) Increase
(b) Constant
(c) Decrease
(d) None of these
›Reveal solutionSolution
For an inferior good, demand decreases when consumer income increases.

Why:

An inferior good is defined by a negative relationship between income and demand. …
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CBSE 2023Set ANNUAL1 markMCQ
$Q. An example of inferior goods in follows - (A) Jewellery (B) Modern dress (C) Coarse cereals (D) Smart phone$
›Reveal solutionSolution

Coarse cereals are an inferior good, so (C) is correct.

Goods are classified by how demand responds to income. For a normal good demand rises with income; for an inferior good demand falls with income as the consumer substitutes a better alternative. As income rises, households buy more jewellery (A), bette …

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CBSE 2022Set MARCH1 mark
$Q. As income increases the demand curve for normal goods shifts towards ____________.$
›Reveal solutionSolution

As income increases, the demand curve for a normal good shifts to the right.

A normal good is one whose demand moves in the same direction as income. When income rises, the consumer can and does buy more of the good at each and every price, so the entire demand curve shifts rightward (outward). (If income fell, it …

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CBSE 2020Set ANNUAL1 markMCQ
$Q. With an increase in the income of the consumer, the demand for inferior goods$
(a) increases
(b) falls (decreases)
(c) remains constant
(d) remains unknown
›Reveal solutionSolution

For inferior goods, a rise in consumer income reduces demand, so the answer is (b) falls (decreases).

Goods are classified by how their demand responds to income. For normal goods, demand rises when income rises. For inferior goods, the relationship is inverse — as income increases, the consumer can afford better alternatives and therefore buys less of the inferior good. Common textbook examples are coarse cereals or low-quality transpor …

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Q.Explain the relationship between total utility and marginal utility.

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