Class 9 Social Science Chapter 9 Important Questions and Answers on Changing Prices
Follow the change behind each price: has buying increased, production fallen or transport improved? Use the questions below to explain these links, calculate shortages and surpluses, and assess why governments sometimes step into markets.
Class 9 Social Science Chapter 9 Important MCQs with Answers
Q1. Aarav wants an expensive bicycle but cannot afford it. Does his wish alone count as economic demand?
A. Yes, because every wish creates demand.
B. No, because demand requires both willingness and ability to buy.
C. Yes, because the bicycle is available for sale.
D. No, because only essential goods have demand.
Answer: B. No, because demand requires both willingness and ability to buy.
Q2. A seller offers more notebooks for sale when their price rises, while other conditions remain unchanged. Which principle does this illustrate?
A. Law of demand
B. Diminishing marginal utility
C. Law of supply
D. Market equilibrium
Answer: C. Law of supply.
Q3. At a particular price, buyers want 90 kg of potatoes, but sellers offer only 60 kg. What is the market situation?
A. Excess supply of 30 kg
B. Excess demand of 30 kg
C. Equilibrium at 60 kg
D. Excess demand of 150 kg
Answer: B. Excess demand of 30 kg.
Class 9 Social Science Chapter 9 Very Short Answers: Explain the Key Terms
Q4. State the law of demand.
Answer:
Other things remaining constant, the quantity demanded of a good generally rises when its price falls and falls when its price rises.
Q5. How is market demand different from individual demand?
Answer:
Individual demand is the quantity one consumer is willing and able to buy at a given price. Market demand is the total quantity demanded by all consumers at that same price.
Q6. What is diminishing marginal utility?
Answer:
Diminishing marginal utility means that the additional satisfaction gained from consuming another unit of a product generally decreases as more units are consumed.
Class 9 Social Science Chapter 9 Short Answers: Apply Market Concepts
Q7. A school opens in a neighbourhood, and more families with children move nearby. A stationery shop’s prices remain unchanged, but its sales increase. Explain why.
Answer:
More families increase the number of potential buyers.
A larger school-going population needs notebooks, pencils and other supplies.
Demand can therefore increase even without a fall in prices.
This shows how the size and composition of a population influence market demand.
Q8. Why might fruit growers supply more fruit to distant towns after gaining access to refrigerated transport?
Answer:
Refrigerated transport reduces spoilage during the journey.
More fruit reaches buyers in a saleable condition.
Growers can serve markets that were previously difficult to reach.
Lower losses can make supplying those markets more worthwhile.
Improved technology can therefore increase the quantity available for sale.
Q9. Observe the two product pairs. Explain how a rise in the price of one item could affect demand for the other. Assume other conditions remain unchanged.
Answer:
A—Complementary goods: Fountain pens and compatible ink are used together. If fountain pens become more expensive and fewer are bought, demand for their ink may also fall.
B—Substitute goods: Butter and margarine can replace each other for some uses. If butter becomes more expensive, some buyers may switch to margarine, increasing demand for it.
Class 9 Social Science Chapter 9 Long Answers: Analyse Market Situations
Q10. In a fictional market, at ₹20 per kg, buyers demand 100 kg of a vegetable while sellers supply 40 kg. At ₹30, both quantities are 70 kg. At ₹40, buyers demand 40 kg while sellers supply 100 kg. Present the outcomes in a table and explain how prices may adjust.
Answer:
At ₹20: Buyers want more than sellers offer. Competition for the available vegetables can push the price upwards.
At ₹30: Demand equals supply. The equilibrium price is ₹30 per kg, and the equilibrium quantity is 70 kg.
At ₹40: Sellers offer more than buyers want. Unsold stock can encourage sellers to lower prices.
These adjustments assume other conditions remain unchanged. Weather, costs or changing preferences can alter the outcome.
Q11. A town faces two problems: an essential medicine has become unaffordable for many residents, and several streets have no lighting. Explain why government action may be needed and why intervention should be carefully designed.
Answer:
Making essentials accessible
Markets distribute goods partly according to people’s ability to pay. A high medicine price can therefore prevent low-income households from obtaining an essential product. A carefully designed maximum price, or price ceiling, may help protect consumers from overcharging.
Providing shared services
Streetlighting benefits many people together. Collecting a separate payment from every person who benefits can be difficult. Government funding can help provide such services for the community.
Considering possible drawbacks
A price set too low may discourage producers from supplying the medicine.
Reduced supply can create shortages.
Complicated compliance procedures can raise costs, particularly for small enterprises.
Excessive restrictions may discourage investment and innovation.
Government action should protect public welfare while considering supply, costs and the ability of enterprises to operate.
Q12. Study the illustration of two stages in a flower market’s day. Explain why the seller may reduce prices later, why some sales may still remain difficult, and how better storage could change the situation.
Answer:
Unsold stock creates pressure: The seller still has flowers available as the selling day ends.
Flowers are perishable: Their quality falls over time, so waiting may make them harder to sell.
A lower price can attract buyers: Some customers may buy more when prices fall.
Price is not the only consideration: Buyers may reject flowers that have lost freshness, even at a discount.
Better storage can reduce losses: Proper storage can preserve freshness and keep flowers saleable longer.
The outcome depends on both sides: Final sales depend on available supply and buyers’ willingness and ability to purchase.
Explain Price Changes Clearly in Class 9 Social Science Chapter 9 Answers
A useful answer connects the cause with the market outcome. Practise these checks with the Class 9 Social Science Chapter 9 important questions and answers:
Identify what changed first: A poor harvest affects supply; a festival can increase demand.
Separate a price change from other influences: More purchases after a price cut differ from more purchases caused by rising incomes.
Use “other things remaining constant”: Demand and supply laws examine one relationship while holding other factors steady.
Calculate the gap: Compare quantities demanded and supplied to find the shortage or surplus.
Avoid guaranteed predictions: Say a shortage creates upward price pressure rather than assuming every price rises immediately.
Use Vedantu’s Important Questions to Check Your Reasoning
Vedantu’s solved examples help you see whether you can explain a result, rather than recognise a familiar definition.
Trace the opposite outcome: If supply increases instead of falling, explain how price pressure changes.
Check units: Keep price per kg separate from quantities measured in kg.
Test related goods: Ask whether products replace each other or are used together before predicting demand.
Read the whole picture: In the flower-stall question, consider freshness as well as price.
Improve one weak answer: Use the Class 9 Social Science Chapter 9 important questions PDF to reattempt a question with a clearer cause-and-effect explanation.
Class 9 Social Science Chapter 9 The Price Puzzle: What Drives the Market Study Materials
Use these resources alongside the solved questions for fuller explanations and textbook practice.
Class 9 Social Science Chapter-wise Important Questions
Important Study Materials for CBSE Class 9 Social Science
FAQs on Important Questions for Class 9 Social Science Chapter 9 The Price Puzzle: What Drives the Market | 2026-27
1. Which concepts should I prepare for the " The Price Puzzle: What Drives the Market question answers?
Prepare demand, supply, their determinants, related goods and market equilibrium. Also practise calculating shortages and surpluses, explaining changing prices, and discussing the benefits and limitations of government intervention.
2. Does wanting a product always create demand?
No. Economic demand requires both willingness and ability to buy at a particular price. A wish without purchasing power does not count as effective demand.
3. How can I distinguish demand from quantity demanded?
Quantity demanded refers to how much buyers will purchase at a particular price. A change in the product’s own price changes quantity demanded along a demand curve. Factors such as income, preferences or the number of buyers can change demand itself.
4. How do I calculate a shortage or surplus in a question?
If quantity demanded exceeds quantity supplied, subtract supply from demand to find the shortage. If supply exceeds demand, subtract demand from supply to find the surplus. Always include the correct unit.
5. Does market equilibrium mean prices will never change?
No. Equilibrium describes a balance under particular conditions. Changes in weather, technology, costs, incomes or preferences can disturb that balance and lead the market towards a different outcome.
6. What is the difference between a price ceiling and a price floor?
A price ceiling sets the maximum permitted price, while a price floor sets the minimum. A ceiling below equilibrium can create a shortage; a floor above equilibrium can create a surplus in a simple goods market.
