The Price Puzzle: What Drives the MarketClass 9 Social Science NCERT Solutions
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Q1Questions and activities
An increase in income always leads to a rise in demand for goods. Defend or refute, giving reasons for the same.
Solution
This statement can be refuted. An increase in income does not always lead to a rise in demand for all goods.
As stated in the chapter, when household income rises, "the quantity demanded for several goods rises, even if prices remain the same." The use of the word "several" implies that this is not a universal rule for all goods. While a rise in income generally increases a consumer's purchasing power and confidence, leading to higher demand for many products, it can also cause a shift in consumer preferences.
For example, the chapter mentions that with a rise in income, consumers may "choose higher-quality products." This means that while the demand for higher-quality, more expensive goods may increase, the demand for lower-quality or cheaper alternatives might decrease, even though the consumer's income has gone up. Therefore, the effect of an income increase on demand depends on the type of good and the consumer's changing preferences.
Q2Questions and activities
If petrol prices double, what happens to a. Demand for diesel cars b. Demand for electric cars c. Demand for car accessories d. Demand for public transport
Solution
If petrol prices double, the demand for related goods will be affected as follows, based on the concepts of substitute and complementary goods:
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a. Demand for diesel cars: The demand for diesel cars will likely increase. Petrol and diesel cars are substitute goods, meaning they can be used in place of each other. When the price of using a petrol car rises significantly due to higher fuel costs, consumers will look for cheaper alternatives. Diesel cars would become a relatively more attractive option, thus increasing their demand.
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b. Demand for electric cars: The demand for electric cars will also increase. Similar to diesel cars, electric cars are substitute goods for petrol cars. A sharp rise in petrol prices makes the running cost of electric cars, which do not use petrol, much more appealing to consumers.
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c. Demand for car accessories: The demand for car accessories will likely decrease. Car accessories (like seat covers, stereos, etc.) are complementary goods to cars, meaning they are often used together. If high petrol prices lead to a decrease in the demand for new petrol cars and less usage of existing ones, the overall demand for related accessories will also fall.
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d. Demand for public transport: The demand for public transport will increase. Public transport is a substitute for private car travel. As the cost of driving a petrol car doubles, many people will switch to more affordable modes of transportation like buses and trains, thereby increasing the demand for public transport.
Q3Questions and activities
A farmer traditionally irrigates fields manually (labour-intensive). He installs drip irrigation (a technology upgrade) that reduces water use by 40 per cent and increases yield by 30 per cent. How does this affect a. His cost of production b. His willingness to supply at different prices c. The overall market supply if many farmers adopt this technology
Solution
The adoption of drip irrigation technology will have the following effects:
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a. His cost of production: The farmer's cost of production will decrease. The chapter explains that "Improvement in technology reduces the cost of production." In this case, drip irrigation reduces the amount of water needed by 40% and is less labour-intensive than manual irrigation. These savings on key inputs like water and labour lower the overall cost required to produce each kilogram of the crop.
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b. His willingness to supply at different prices: The farmer's willingness to supply at different prices will increase. Since the cost of production is lower, the farmer can now make a profit even at a lower selling price. This increased profitability incentivises the farmer to produce and sell more at any given price level. This would be represented by a rightward shift in the individual farmer's supply curve.
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c. The overall market supply if many farmers adopt this technology: If many farmers adopt this technology, the overall market supply will increase significantly. As explained in the chapter, market supply is the sum of all individual supplies. When a large number of producers reduce their costs and increase their output, the total quantity of the crop available in the market at every price point rises. This large increase in market supply would likely lead to a fall in the equilibrium price of the crop.
Q4Questions and activities
During online festival sales, the prices of many products are very low. Use the concept of demand and supply to explain why the sellers sell at such a low price. What happens to the equilibrium when the price is lowered? Does this benefit only consumers or sellers as well? Explain.
Solution
During online festival sales, sellers offer products at very low prices to stimulate a massive increase in the quantity demanded. This strategy is based on the law of demand, which states that as price falls, quantity demanded rises.
Sellers do this for several reasons:
- To Increase Total Revenue: While the profit per item is lower, the sheer volume of sales can lead to a higher total revenue. As the chapter defines it, revenue is the total money a business earns from sales.
- To Clear Inventory: Sales are an effective way to sell off old stock to make room for new models or products.
- To Attract New Customers: Low prices can attract customers who might not otherwise purchase from the seller, potentially turning them into loyal customers in the future.
When the price is deliberately lowered below the market equilibrium price, it creates a situation of excess demand (or a shortage), where the quantity consumers want to buy is greater than the quantity sellers have supplied at that low price.
This situation benefits both consumers and sellers:
- Consumers: They benefit directly by being able to purchase goods at a much lower price than usual.
- Sellers: They benefit by achieving a high volume of sales, which can maximize overall revenue, clear out old inventory, and increase their market share and brand visibility. Even with lower margins, the high turnover can be very profitable.
Q5Questions and activities
Suppose the government sets a maximum sale price for an essential vaccine below the market-driven price. What is likely to happen? Choose from the options below and elucidate your point. a. Surplus b. Shortage c. No effect d. Fall in demand
Solution
The correct answer is b. Shortage.
Elucidation:
A maximum sale price set by the government is known as a price ceiling. According to the chapter, for a price ceiling to be effective, it must be set below the market equilibrium price. This intervention has two main effects:
- Effect on Demand: The lower price makes the vaccine more affordable, which causes the quantity demanded to increase. More people will be willing and able to buy the vaccine at this price.
- Effect on Supply: The lower price reduces the profitability for producers. As the chapter notes under "Limitations of Government Intervention," when the government fixes prices below market levels, "producers may lose motivation to supply goods or services." This leads to a decrease in the quantity supplied.
When the quantity demanded is greater than the quantity supplied (Qd > Qs), the result is a shortage. There are not enough vaccines available to meet the needs of everyone who wants to buy one at the government-controlled price.
Q6Questions and activities
The government levies higher taxes on products such as tobacco and alcohol to promote healthier choices among citizens. Can you find out other goods where price controls have been set in place? What are the reasons for the same?
Solution
Based on the chapter, the government sets price controls on various goods to ensure fairness, equity, and the welfare of citizens. The chapter provides the following examples:
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Medicines: The government sets maximum prices (price ceilings) for essential medicines. The reason for this is to prevent overcharging by sellers and ensure that these critical goods are accessible and affordable for all, especially low-income groups.
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Sanitisers (during an emergency): During the COVID-19 pandemic, the government intervened by capping the maximum retail price of sanitisers. This was done to combat hoarding, black-marketing, and unfair price hikes when demand surged, ensuring that this essential commodity remained available to the public at a fair price.
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Wages: The government sets a minimum wage, which acts as a price floor for labour. This is not a price control on a good, but on the service of labour. The reason is to protect workers from exploitation and ensure they earn a wage sufficient for a basic standard of living.
In all these cases, the primary reason for government intervention is that the free market might lead to outcomes that are considered unfair or detrimental to social welfare.
Q7Questions and activities
Can excessive government regulation hurt markets? Explain with suitable examples.
Solution
Yes, excessive government regulation can hurt markets. While intervention is sometimes necessary, the chapter outlines several adverse effects when it is excessive.
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Price Distortions and Reduced Producer Incentives: When the government sets prices below the market equilibrium (a price ceiling), it reduces the profitability for producers. This can demotivate them from producing, leading to a fall in supply and creating shortages. For example, the chapter mentions that if the government sets a maximum price for wheat at ₹20 per kg when the market price is ₹30, farmers may receive less, which could lead them to reduce wheat production.
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Compliance Burdens: Extensive regulations, licenses, and permits create a significant administrative and financial burden on businesses, especially small enterprises. This can discourage entrepreneurship and hamper the ease of doing business. The chapter uses the example of a small restaurant that may need multiple clearances for food safety, fire safety, and pollution control, making it difficult to start or expand.
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Discourages Innovation and Entrepreneurship: Heavy regulation and price controls can reduce the incentive for businesses to innovate or invest in better technology. If producers cannot earn adequate returns due to price caps, they are less likely to invest in research and development. For instance, if farmers' earnings are limited by price controls on their crops, they will not invest in better seeds or irrigation technology, which hurts long-term productivity and output.
Q8Questions and activities
In the table below, different prices of guava are given.
a. Think and write how much guava you will buy at each price.
b. Ask the same question to three of your friends and fill in the table.
c. Also make a graph for each one of you and one final graph for the total quantity.
Price You Friend 1 Friend 2 Friend 3 Total ₹100/kg ₹80/kg ₹50/kg ₹20/kg
Solution
This is an activity to demonstrate the law of demand and the concept of market demand. The solution involves creating a hypothetical demand schedule and explaining how to graph it.
a & b. Filling the table:
According to the law of demand, as the price of a good decreases, the quantity demanded increases. Following this principle, a hypothetical completed table would look like this:
| Price | You (kg) | Friend 1 (kg) | Friend 2 (kg) | Friend 3 (kg) | Total (kg) |
|---|---|---|---|---|---|
| ₹100/kg | 0.5 | 0 | 1 | 0.5 | 2 |
| ₹80/kg | 1 | 0.5 | 1.5 | 1 | 4 |
| ₹50/kg | 2 | 1.5 | 2.5 | 2 | 8 |
| ₹20/kg | 4 | 3 | 4 | 3.5 | 14.5 |
The 'Total' column represents the market demand, which is calculated by summing the individual quantities demanded by you and your friends at each price level.
c. Making the graphs:
To make the graphs, you would follow these steps:
- Set up the axes: For each graph, the vertical axis (Y-axis) represents the Price (in ₹/kg), and the horizontal axis (X-axis) represents the Quantity Demanded (in kg).
- Plot Individual Demand Curves: For each person (You, Friend 1, etc.), plot the points from the table (e.g., for 'You', plot (0.5, 100), (1, 80), (2, 50), and (4, 20)). Connect these points to create a downward-sloping line. This is the individual demand curve.
- Plot the Market Demand Curve: On a final graph, plot the points from the 'Total' column against the corresponding prices (e.g., (2, 100), (4, 80), (8, 50), and (14.5, 20)). Connecting these points will give you the market demand curve.
As shown in the chapter with Srivalli's demand for mangoes, the market demand curve will also be downward-sloping but will be flatter than the individual demand curves. This is because the total market demand is more responsive to price changes than any single individual's demand.
Q9Questions and activities
Visit the nearby vegetable market and try to find answers to the following questions. a. Who decides the prices of different vegetables in the vegetable market? b. Sometimes the prices of a few vegetables is too high, and sometimes too low. Why is this? c. The price of tomatoes is high in the morning and eventually gets lower by the evening. Have you ever noticed this? Comment.
Solution
Based on the principles discussed in the chapter, here are the answers to the questions about the vegetable market:
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a. Who decides the prices of different vegetables in the vegetable market? No single person decides the prices. As the chapter explains, prices of all goods and services are determined by the interaction of two powerful forces: demand and supply. In a vegetable market, prices are set through the continuous negotiation between buyers (consumers) and sellers (vendors). The final price is the one at which the quantity of vegetables sellers are willing to sell matches the quantity buyers are willing to purchase.
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b. Sometimes the prices of a few vegetables is too high, and sometimes too low. Why is this? Prices fluctuate because the demand for and supply of vegetables are constantly changing. The chapter highlights several factors:
- Supply Changes: Weather conditions (droughts, floods), crop diseases, or a good harvest can drastically affect the supply. A poor harvest reduces supply, leading to high prices, while a bumper crop increases supply, causing prices to fall.
- Demand Changes: Demand is influenced by seasonality and festivals. For example, the demand for certain vegetables might increase during a festival, pushing prices up. Similarly, some vegetables are only in high demand during specific seasons.
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c. The price of tomatoes is high in the morning and eventually gets lower by the evening. Have you ever noticed this? Comment. This common observation is a real-world example of supply and demand dynamics for perishable goods. In the morning, sellers set a higher price because the vegetables are fresh and they have the entire day to sell them. However, tomatoes are perishable and will spoil if not sold. As the day progresses, sellers become more anxious to clear their stock to avoid a total loss. To encourage more people to buy, they lower the prices. This increases the quantity demanded and helps them sell the remaining produce before the market closes. This is a practical application of adjusting price to influence demand for a product with a very short shelf life.
Q10Questions and activities
Categorise the following combination of goods into substitute goods and complementary goods. a. Movie ticket in the cinema hall and popcorn b. Eraser and pencil c. Laptop and computer d. Air Conditioner and cooler e. Notebook and pen f. Apple and banana g. Mobile and earphones
Solution
Based on the definitions in the chapter, where substitute goods can replace each other and complementary goods are used together, the items can be categorized as follows:
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a. Movie ticket in the cinema hall and popcorn: Complementary goods. Popcorn is often consumed while watching a movie in a cinema hall. A fall in movie ticket prices might increase the demand for popcorn.
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b. Eraser and pencil: Complementary goods. They are used together for writing and correcting mistakes.
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c. Laptop and computer: Substitute goods. A consumer typically chooses one over the other to perform similar computing tasks.
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d. Air Conditioner and cooler: Substitute goods. Both are used for cooling, and a consumer might choose one as an alternative to the other based on price, efficiency, or climate.
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e. Notebook and pen: Complementary goods. They are used together for writing.
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f. Apple and banana: Substitute goods. They are both fruits and can be chosen as alternatives for each other in a diet.
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g. Mobile and earphones: Complementary goods. As mentioned in the chapter, earphones are used together with smartphones to listen to audio privately.
Q11Questions and activities
Fig. 9.8 shows the demand curve DD' and Supply curve SS'. Based on the figure, answer the following questions: a. What does point E represent in this market? b. What is the equilibrium price and equilibrium quantity at point E? c. Point A lies on DD'. Point B lies on SS'. What do the points A and B indicate about demand and supply? What does the gap between A and B (both on the upper dashed price line) represent? d. Point F lies on DD'. Point C lies on SS'. What do the points F and C indicate about demand and supply? What does the gap between C and F (both on the lower dashed price line) represent? e. If the price stays at the lower dashed line, what could happen next in a free market?
Solution
Based on the analysis of Figure 9.8 and the concepts in the chapter:
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a. What does point E represent in this market? Point E represents the market equilibrium. This is the point where the demand curve (DD') intersects the supply curve (SS'). At this point, the quantity of the good that buyers are willing to purchase is exactly equal to the quantity that sellers are willing to offer.
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b. What is the equilibrium price and equilibrium quantity at point E? At point E, the equilibrium price is the price level corresponding to point E on the vertical (price) axis. The equilibrium quantity is the quantity level corresponding to point E on the horizontal (quantity) axis. At this price, the market is 'cleared'.
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c. What do the points A and B indicate about demand and supply? What does the gap between A and B represent? At the higher price level (upper dashed line), point A on the demand curve indicates a low quantity demanded, while point B on the supply curve indicates a high quantity supplied. The horizontal gap between point A and point B represents an excess supply or a surplus, where the quantity supplied is greater than the quantity demanded (Qs > Qd).
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d. What do the points F and C indicate about demand and supply? What does the gap between C and F represent? At the lower price level (lower dashed line), point C on the supply curve indicates a low quantity supplied, while point F on the demand curve indicates a high quantity demanded. The horizontal gap between point C and point F represents an excess demand or a shortage, where the quantity demanded is greater than the quantity supplied (Qd > Qs).
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e. If the price stays at the lower dashed line, what could happen next in a free market? If the price stays at the lower dashed line, there is a shortage. In a free market, this situation would cause the price to rise. Buyers, unable to get the product, would be willing to pay more. Sellers, seeing the high demand and depleted stock, would raise their prices. This upward pressure on the price would continue until it reaches the equilibrium price at point E, where the shortage is eliminated.
Q12Questions and activities
Draw a market equilibrium graph using the following demand schedule.
Price (₹) 10 20 30 40 50 Q.D. (kg) 5 10 15 20 25 Q.S. (kg) 25 20 15 10 5
a. Plot the demand and supply curve using the above data.
b. Identify the equilibrium price and quantity.
c. Observe the above data and analyse what happens if the price is set at ₹20 or ₹40.
Solution
There appears to be a typographical error in the provided data. The Law of Demand states that quantity demanded (Q.D.) falls as price rises, but the table shows Q.D. rising with price. The Law of Supply states that quantity supplied (Q.S.) rises with price, but the table shows Q.S. falling with price.
Assuming the labels for Q.D. and Q.S. have been swapped, the corrected data should be:
| Price (₹) | 10 | 20 | 30 | 40 | 50 |
|---|---|---|---|---|---|
| Corrected Q.D. (kg) | 25 | 20 | 15 | 10 | 5 |
| Corrected Q.S. (kg) | 5 | 10 | 15 | 20 | 25 |
Based on this corrected data:
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a. Plot the demand and supply curve using the above data. To plot the graph, you would set the vertical axis as Price (from ₹10 to ₹50) and the horizontal axis as Quantity (from 5 kg to 25 kg).
- Demand Curve: Plot the points for Corrected Q.D. against price: (25, 10), (20, 20), (15, 30), (10, 40), (5, 50). Connecting these points will result in a downward-sloping demand curve.
- Supply Curve: Plot the points for Corrected Q.S. against price: (5, 10), (10, 20), (15, 30), (20, 40), (25, 50). Connecting these points will result in an upward-sloping supply curve. The two curves will intersect.
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b. Identify the equilibrium price and quantity. The market equilibrium occurs where quantity demanded equals quantity supplied. Looking at the corrected table, this happens at a price of ₹30, where both the quantity demanded and the quantity supplied are 15 kg. This is the point where the two curves would intersect on the graph.
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c. Observe the above data and analyse what happens if the price is set at ₹20 or ₹40.
- If the price is set at ₹20: The quantity demanded is 20 kg, but the quantity supplied is only 10 kg. Since demand exceeds supply (Q.D. > Q.S.), there will be an excess demand or a shortage of 10 kg (20 - 10).
- If the price is set at ₹40: The quantity supplied is 20 kg, but the quantity demanded is only 10 kg. Since supply exceeds demand (Q.S. > Q.D.), there will be an excess supply or a surplus of 10 kg (20 - 10).