This chapter explains how markets influence prices through demand and supply. It discusses equilibrium, changing conditions, utility, consumer and producer choices, and the role of government in a regulated market economy.
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Chapter 9 Notes: The Price Puzzle: What Drives the Market
Introduction
Prices in a market do not change randomly. The price of vegetables, mangoes, hotel rooms, flight tickets, mobile phones, or clothes changes because of demand and supply. For example, mangoes may be costly at the beginning of the season but cheaper when more mangoes arrive in the market. Similarly, hotel rooms become expensive during tourist seasons because many people want them. This chapter explains how prices are decided in a market, why they keep changing, and how the government sometimes intervenes to protect people. The two main forces that drive the market are Demand and Supply.
Demand
Demand means the quantity of a product that consumers are willing and able to buy at a particular price. Demand is not just a desire. A person may want to buy an expensive phone, but if they do not have enough money, it is not counted as demand. So, demand includes both: Willingness to buy + Ability to buy This ability to buy is called purchasing power.
Law of Demand
The Law of Demand states that: When the price of a good rises, its quantity demanded decreases. When the price falls, its quantity demanded increases. So, demand and price have an inverse relationship.
Example
If mangoes cost ₹150 per kg, a person may buy only 1 kg. If the price falls to ₹100, they may buy 2 kg. If the price falls to ₹50, they may buy 3 kg. This can be shown through a demand schedule and a demand curve.
Demand Schedule
A demand schedule is a table that shows how much quantity a consumer wants to buy at different prices.
Demand Curve
A demand curve is a graph showing the relationship between price and quantity demanded.
The demand curve usually slopes downward because people buy more when prices fall and buy less when prices rise.
Individual Demand and Market Demand
Individual Demand
Individual demand means the quantity of a good that one consumer wants to buy at different prices. Example: Srivalli’s demand for mangoes at different prices is her individual demand.
Market Demand
Market demand means the total demand of all consumers in the market. It is calculated by adding the demand of all individual buyers. For example: Srivalli’s demand + Alex’s demand + Israt’s demand = Market Demand Market demand is usually greater than individual demand because it includes many buyers.
Other Determinants of Demand
Demand does not depend only on price. Many other factors also influence demand.
a. Price of Related Goods
Related goods are goods whose demand is connected with each other. They are of two types: i. Substitute Goods Substitute goods are goods that can replace each other. Examples: Tea and coffee, apple and banana, AC and cooler If the price of coffee rises, people may start buying more tea. So, when the price of one substitute rises, the demand for the other substitute may increase. ii. Complementary Goods Complementary goods are goods that are used together.
Examples
Mobile and earphones, printer and cartridge, notebook and pen
If the demand for printers increases, demand for cartridges may also increase. If movie tickets become expensive, people may go less to cinemas, so demand for popcorn in cinema halls may fall.
b. Income of the Consumer Income strongly affects demand. When people’s income rises, they can buy more goods and better-quality products. So, demand for many goods increases. For example, if a family’s income increases, they may buy better shoes, a better phone, or more nutritious food. However, demand may not rise equally for all goods. For some basic goods, people may not buy much more even after income increases.
c. Taste and Preference of the Buyer
Every consumer has different likes and dislikes. For example, if Srivalli loves mangoes, she may continue buying mangoes even if oranges are cheaper. Demand also depends on fashion, trends, habits, culture, advertisements, and personal choices.
Example
A new smartphone model may have high demand because people like the brand or trend.
d. Population Size and Composition
Demand also depends on the size and type of population.
A country with a large population has high demand for food, clothes, houses, transport, and services. The composition of population also matters: More children increase demand for school items and sports shoes. More working adults increase demand for formal shoes, office bags, and transport. More elderly people increase demand for comfortable shoes and healthcare services.
e. Seasonality Seasonality means demand changes according to seasons, festivals, weather, and cultural habits.
Examples
Demand for sweaters increases in winter. Demand for sweets increases during festivals. Demand for books and notebooks increases at the beginning of the academic session. Demand for mangoes increases during mango season. So, demand may rise or fall even when prices do not change.
f. Future Price Expectations
Consumers’ expectations about future prices affect present demand. If people expect prices to rise in the future, they may buy the product immediately. If people expect prices to fall, they may postpone their purchase.
Example
Many people delay buying electronics before Diwali because they expect festival discounts.
Diminishing Marginal Utility
The chapter also explains the idea of diminishing marginal utility. Diminishing marginal utility means that the extra satisfaction from consuming more units of a product keeps decreasing.
Example
The first mango tastes very delicious. The second mango is also good. But after eating many mangoes, the desire to eat more decreases. So, as we consume more of something, our willingness to pay for each additional unit decreases.
Supply
Supply means the quantity of a product that sellers are willing and able to offer at a particular price. Supply is related to the seller’s willingness to produce and sell goods.
Law of Supply
The Law of Supply states that: When the price of a good rises, quantity supplied increases. When the price falls, quantity supplied decreases. So, supply and price have a direct relationship.
Why?
Because higher prices increase profit. When producers expect more profit, they produce and sell more.
Example
If mangoes sell at ₹50 per kg, a seller may supply only 1 kg. If the price rises to ₹100, the seller may supply 2 kg. If the price rises to ₹150, the seller may supply 3 kg.
Individual Supply and Market Supply
Individual Supply
Individual supply means the quantity supplied by one seller at different prices.
Market Supply
Market supply means the total quantity supplied by all sellers in the market. It is calculated by adding the supply of all individual sellers.
Seller A + Seller B + Seller C = Market Supply
The supply curve usually slopes upward because sellers supply more when prices rise.
Other Determinants of Supply
Supply also depends on factors other than price.
a. Price of Related Goods
A producer may choose to produce the good that gives higher profit.
Example
If wheat prices are low but chickpea prices are high, a farmer may grow more chickpeas next season.
So, the supply of one good depends on the profitability of other goods.
b. Number of Sellers in the Market
If there are more sellers in the market, total supply increases. When supply increases more than demand, prices may fall. If there are fewer sellers, supply decreases. When supply is less than demand, prices may rise.
Example
If many shops start selling the same mobile phone, supply increases and prices may become competitive.
c. Technology Improved technology reduces production cost and increases supply.
Example
Drip irrigation and weather sensors can increase crop production. Cold storage helps transport mangoes to distant markets and increases supply. When production becomes easier and cheaper, producers can supply more goods.
d. Future Expectations Producers also make decisions based on expected future demand and prices. If producers expect demand to increase in the future, they may produce more. If they expect prices to rise later, they may hold back supply now and sell later at higher prices.
Example
Potato wholesalers may store potatoes if they expect prices to rise in the future.
Market Equilibrium
Market equilibrium is the point where quantity demanded equals quantity supplied. At this point: Demand = Supply There is no excess demand and no excess supply. The price at which this happens is called the equilibrium price. The quantity at which this happens is called the equilibrium quantity. Example from the chapter: At ₹100, quantity demanded = 12 kg and quantity supplied = 12 kg. So: Equilibrium Price = ₹100 Equilibrium Quantity = 12 kg
Excess Demand and Excess Supply Excess Demand
Excess demand occurs when quantity demanded is greater than quantity supplied. This happens when the price is too low.
Example
If mangoes are very cheap, many people want to buy them, but sellers may not supply enough. This creates a shortage.
When there is excess demand, prices usually rise.
Excess Supply
Excess supply occurs when quantity supplied is greater than quantity demanded. This happens when the price is too high.
Example
If mangoes are very expensive, sellers may bring many mangoes, but buyers may buy less. This creates a surplus. When there is excess supply, prices usually fall.
Does Market Equilibrium Exist in the Real World?
In theory, equilibrium is a stable point where demand and supply are equal. But in the real world, markets are always changing. So, equilibrium is not always fixed. Demand and supply change because of: Weather Festivals Technology Income Trends Wars Pandemics Natural disasters Political events
Example
During COVID-19, demand for masks increased suddenly. Supply could not increase immediately, so mask prices rose. Later, more producers started making masks, supply increased, and prices fell.
So, real markets are dynamic, meaning they keep changing and adjusting.
Tariffs by Hotels: An Example of Dynamic Markets
Hotel room prices are a good example of dynamic pricing. A hotel does not charge the same room tariff every day. Prices change according to demand, season, events, and availability. Example from the chapter:
- Off-season weekday in July
- ₹1,500 per night
- Weekend during tourist season in December
- ₹8,000 per night
- New Year’s Eve
- ₹25,000 per night
If a group booking is cancelled, the hotel may reduce prices quickly to fill empty rooms. Hotel tariffs depend on: Speed of bookings Prices charged by nearby hotels Festivals and events Weather forecasts Number of days left before arrival Past booking trends This shows that prices in real markets keep changing according to demand and supply.
Role of Government in the Economy
Markets do not always work fairly. Sometimes essential goods become too expensive. Sometimes sellers exploit consumers. Sometimes private companies do not provide goods needed by everyone. Therefore, the government plays an important role in the economy.
India is described in the chapter as a market-based, regulated economy, where prices are mainly decided by demand and supply, but the government also regulates markets when needed.
Regulation of Unfair Practices
The government regulates unfair practices to protect:
- Consumers
- Workers
- Producers
Price Ceiling
A price ceiling is the maximum price that a seller can charge for a product or service.
Example
The government may fix the maximum price of essential medicines to prevent overcharging.
Price Floor
A price floor is the minimum price that can be charged for a product or service.
Example
Minimum wages are a type of price floor. The government sets minimum wages so workers get fair payment.
Monopoly
A monopoly exists when a single seller controls the supply of a product or service. A monopolist may charge high prices, reduce supply, and provide poor quality. So, the government regulates monopolies to protect consumers.
Example: Sanitisers During COVID-19
During COVID-19, demand for sanitisers increased suddenly. Some shopkeepers started hoarding and black-marketing. Hoarding means storing goods in large quantities to create shortage or sell later at higher prices. Black marketing means illegal selling of goods at unfair or higher prices. The government intervened by declaring sanitisers essential commodities and fixing the maximum retail price. This helped consumers get sanitisers at fair prices.
Provision of Public Goods
Public goods are goods and services provided by the government for the benefit of all citizens. Examples: Roads Bridges Public parks Streetlights National defence Sanitation Drainage systems Police services Private companies usually do not provide many public goods because they may not earn direct profit from them.
Example
A public park benefits everyone in the neighbourhood. But if each family is asked to pay, some may refuse and still use the park later. So, the government provides such goods for social welfare and equal access.
Limitations of Government Intervention
Government intervention is important, but too much intervention can create problems.
a. Price Distortions and Reduced Producer Incentives
If the government fixes prices below market levels, producers may lose interest in producing goods.
Example
If the market price of wheat is ₹30 per kg but the government fixes it at ₹20 per kg, farmers may earn less. This can reduce production and create shortages.
b. Compliance Burdens Too many rules, licenses, permits, and procedures can make it difficult to run a business. Small businesses may suffer because they may not have enough time or money to complete all formalities.
Example
A small restaurant may need permissions related to food safety, fire safety, pollution control, and local clearances. This can discourage small entrepreneurs.
c. Discourages Innovation and Entrepreneurship
Heavy regulation and price controls can reduce the motivation to invest in new ideas and better technology.
Example
If farmers cannot earn enough profit, they may not invest in better seeds, irrigation, or machines. This reduces long-term productivity.
Quick revision
Chapter summary
Important Terms
- Demand
- Quantity consumers are willing and able to buy at a particular price.
- Supply
- Quantity sellers are willing and able to offer at a particular price.
- Law of Demand
- Price rises, demand falls; price falls, demand rises.
- Law of Supply
- Price rises, supply rises; price falls, supply falls.
- Market Demand
- Total demand of all buyers.
- Market Supply
- Total supply of all sellers.
- Substitute Goods
- Goods that can replace each other, such as tea and
coffee. Complementary Goods: Goods used together, such as mobile and earphones.
- Market Equilibrium
- Point where demand equals supply.
- Equilibrium Price
- Price at which demand and supply are equal.
- Equilibrium Quantity
- Quantity bought and sold at equilibrium price.
- Price Ceiling
- Maximum price fixed by the government.
- Price Floor
- Minimum price fixed by the government.
- Monopoly
- Market controlled by a single seller.
- Public Goods
- Goods provided by the government for everyone’s benefit.
- Hoarding
- Storing goods unnecessarily to create shortage or sell later at
higher prices. Black Marketing: Illegal selling of goods at unfair prices.
Chapter Summary
Chapter 9 explains how prices are determined in a market. Prices are mainly influenced by demand and supply. Demand means the quantity consumers are willing and able to buy, while supply means the quantity sellers are willing and able to sell. According to the Law of Demand, when price rises, demand falls; and when price falls, demand rises. According to the Law of Supply, when price rises, supply rises; and when price falls, supply falls. Demand is affected by many factors such as income, taste and preference, related goods, seasonality, future price expectations, and population. Supply is affected by related goods, number of sellers, technology, input costs, weather, and future expectations.
When demand and supply become equal, the market reaches market equilibrium. At this point, there is no shortage or surplus. However, in real life, markets are always changing due to weather, technology, trends, festivals, disasters, and other factors. Therefore, real-world markets are dynamic. The chapter also explains that the government plays an important role in the economy. It protects consumers from unfair practices, controls monopoly, fixes prices or wages when necessary, and provides public goods such as roads, parks, streetlights, sanitation, and defence. However, too much government intervention can also create problems. It may reduce producer incentives, increase compliance burdens, and discourage innovation. Therefore, government intervention should be balanced and carefully planned.
The main message of the chapter is that prices are not random. They are the result of changing demand, supply, expectations, technology, seasons, and government policies. Understanding these forces helps us make better economic decisions in everyday life.
Core concepts
The Big Questions – answers
Q1What are the factors that influence the demand for and supply of goods and services in a market?
The demand and supply of goods and services are influenced by many factors. Factors affecting demand include: Price of the good: When price rises, demand usually falls; when price falls, demand usually rises. Income of the consumer: When income increases, people can buy more goods and better-quality products. Price of related goods: Demand changes because of substitute goods and
complementary goods. Taste and preference: People buy more of what they like or what is fashionable. Seasonality: Demand changes during festivals, seasons, weather changes, and school sessions. Future price expectations: If people expect prices to rise, they may buy now. If they expect prices to fall, they may wait. Population size and composition: More children, adults, or elderly people create demand for different goods. Factors affecting supply include:
- Price of the good
- When price rises, sellers usually supply more.
- Price of related goods
- Producers choose goods that give more profit.
- Number of sellers
- More sellers increase supply; fewer sellers reduce supply.
- Technology
- Better technology reduces cost and increases supply.
- Cost of inputs
- If raw materials, labour, or transport become costly, supply
may fall. Weather and disasters: Good weather may increase agricultural supply, while floods or droughts reduce it. Future expectations: If sellers expect higher prices later, they may hold back supply now.
Q2How are prices of goods and services determined through demand and supply interactions?
Prices are determined by the interaction of demand and supply. When demand is greater than supply, there is a shortage. Buyers compete for the limited goods, so the price rises. When supply is greater than demand, there is a surplus. Sellers reduce prices to attract buyers, so the price falls.
When demand and supply become equal, the market reaches equilibrium. At this point, the price becomes stable for some time. For example, at the beginning of the mango season, supply is low, so mangoes are costly. In the middle of the season, supply increases, so prices fall. This shows that prices are not random; they depend on the balance between demand and supply.
Q3What is market equilibrium, and does it exist in the real world?
Market equilibrium is the point where quantity demanded equals quantity supplied. At this point: Demand = Supply There is no shortage and no surplus. The price at this point is called the equilibrium price, and the quantity is called the equilibrium quantity. For example, in the chapter, at ₹100, quantity demanded is 12 kg and quantity supplied is also 12 kg. So, ₹100 is the equilibrium price, and 12 kg is the equilibrium quantity. In the real world, market equilibrium exists only temporarily. Markets are always changing due to weather, festivals, technology, income, trends, wars, pandemics, and natural disasters. Therefore, real markets keep moving towards new equilibrium points but rarely remain fixed at one point for long.
Q4How and why does the government intervene in the market?
The government intervenes in the market because markets do not always work fairly. Sometimes essential goods become too expensive, some sellers exploit consumers, workers may be paid very low wages, or private companies may not provide goods needed by everyone.
The government intervenes in the following ways: Price ceiling: The government may fix the maximum price of essential goods like medicines to prevent overcharging. Price floor: The government may fix minimum wages so workers get fair payment. Regulation of monopoly: If one seller controls the market and charges high prices, the government regulates such unfair practices. Protection of consumers: Regulators protect people from cheating, unfair trade practices, and poor-quality goods. Provision of public goods: The government provides roads, bridges, parks, streetlights, sanitation, drainage, police, and national defence.
However, too much government intervention can also create problems. It may reduce producer motivation, increase paperwork, and discourage innovation. So, government intervention should be balanced and based on public welfare.
Textbook activities
Think About It and Let's Explore – answers
THINK ABOUT IT – Page 199
Q1What happens when you consume the first mango? It tastes delicious, right? The second one is good? The third one and so on? You are barely interested in eating mangoes by this point. Why do you think this happens?
This happens because of the diminishing marginal utility principle. When we consume the first mango, we get a lot of satisfaction because we are hungry and excited to eat it. The second mango also gives satisfaction, but slightly less than the first. As we keep eating more mangoes, the additional satisfaction from each extra mango keeps decreasing. This means that the extra usefulness or satisfaction from consuming more units of the same product falls gradually.
As a result, our willingness to pay for more mangoes also decreases. This is why a person may be ready to pay more for the first mango but not for the fifth or sixth mango. So, the demand for a product may fall when the consumer gets less additional satisfaction from consuming more of it.
LET’S EXPLORE – Page 200
Q2Create your own demand schedule for buying notebooks at different prices. At what price would you buy the most? At what price would you stop buying altogether? What could be the reason behind your choices?
Here is a simple demand schedule for buying notebooks:
Price of one notebook Quantity I would buy
| ₹10 | 6 notebooks |
|---|---|
| ₹20 | 4 notebooks |
| ₹30 | 3 notebooks |
| ₹50 | 1 notebook |
| ₹80 | 0 notebooks |
I would buy the most notebooks at ₹10 because the price is low and affordable. I would stop buying altogether at ₹80 because the price is too high for a notebook. At this price, I may postpone buying, use old notebooks, or look for a cheaper option. This shows the Law of Demand: when price falls, demand rises; when price rises, demand falls.
Q3Ask your family members if they postponed or advanced buying any product because of future expectations of changes in price.
Yes, family members often postpone or advance purchases because of future price expectations. For example, my family may postpone buying a mobile phone, television, or refrigerator before Diwali because they expect festival discounts. In this case, present demand decreases because people wait for lower prices. On the other hand, if they expect the price of cooking oil, petrol, or gold to rise in the future, they may buy it earlier. In this case, present demand increases because people want to avoid paying higher prices later. Thus, future price expectations influence present demand.
LET’S EXPLORE – Page 203
Q4What happens to the supply of a product in case of a change in the cost of inputs, discovery of an alternate input, depletion of resources, change in weather, disaster, etc.? Discuss in class using examples of diverse goods and services.
The supply of a product changes when the conditions of production change. If the cost of inputs increases, supply usually decreases because production becomes expensive. For example, if the price of fertilisers, seeds, labour, or transport rises, farmers may produce or supply less. If an alternate input is discovered, supply may increase. For example, if a cheaper substitute for a raw material is found, producers can produce more at lower cost. If there is depletion of resources, supply falls. For example, overuse of groundwater can reduce agricultural production in the future.
If the weather is favourable, supply of crops may increase. Good rainfall can increase the supply of food grains. But if there is drought, flood, or extreme heat, crop supply may fall. If there is a disaster, supply may decrease suddenly. For example, floods can damage roads and farms, reducing the supply of vegetables and milk in cities. So, supply depends not only on price but also on input cost, technology, resources, weather, and unexpected events.
LET’S ANALYSE – Page 204
Q5Using data from Table 9.3, plot the demand and supply curve at the three prices, i.e., ₹40, ₹100, and ₹150. Identify and mark excess demand and supply on the graph. Think about how equilibrium could be reached in these scenarios.
The data from Table 9.3 can be written as:
Price Quantity Demanded Quantity Supplied Result
| ₹40 | 38 kg | 6 kg | Excess demand |
|---|---|---|---|
| ₹100 12 kg | 12 kg | Market equilibrium | |
| ₹150 8 kg | 43 kg | Excess supply |
To draw the graph:
- On the Y-axis, mark price: ₹40, ₹100, ₹150.
- On the X-axis, mark quantity in kg.
- For the demand curve, plot the
points: (38, ₹40), (12, ₹100), (8, ₹150)
For the supply curve, plot the points: (6, ₹40), (12, ₹100), (43, ₹150) At ₹40, quantity demanded is 38 kg and quantity supplied is only 6 kg. So there is excess demand of 32 kg. At ₹100, quantity demanded and quantity supplied are both 12 kg. So this is the market equilibrium. At ₹150, quantity supplied is 43 kg and quantity demanded is only 8 kg. So there is excess supply of 35 kg. Equilibrium can be reached in this way: When price is ₹40, demand is more than supply, so sellers may raise prices. When price is ₹150, supply is more than demand, so sellers may reduce prices. When price reaches ₹100, demand and supply become equal, so the market clears.
Therefore, equilibrium price = ₹100 and equilibrium quantity = 12 kg.
THINK ABOUT IT – Page 205
Q6Can you think of another real-life example other than hotels where prices change frequently? Explain why the prices keep changing.
Yes, flight tickets are a good example where prices change frequently. The price of a flight ticket changes according to demand, seat availability, festivals, holidays, booking time, and travel season. If many people want to travel on the same route, ticket prices rise. If seats are empty and the travel date is near, airlines may reduce prices to fill seats.
For example, flight tickets become expensive during Diwali, summer vacations, and New Year because demand is high. But on ordinary weekdays, prices may be lower because demand is less. This shows that prices change because markets are dynamic.
Q7Our choices today affect future resources. For example, high demand for fast fashion, overfishing and overuse of groundwater can harm future supply. So, should we focus only on short-term gains, or also think about long-term sustainability? How could this affect the market equilibrium?
We should not focus only on short-term gains. We must also think about long-term sustainability. If people keep demanding fast fashion, fish, or groundwater without limits, resources may get depleted. This will reduce future supply. When future supply falls, prices may rise and equilibrium quantity may fall. This means goods may become costly and less available. For example, if groundwater is overused today, farmers may face water shortages in the future. This can reduce crop production, decrease supply, and increase food prices. Therefore, sustainable use of resources helps maintain stable supply, fair prices, and better market equilibrium in the long run.
THINK ABOUT IT – Page 206
Q8Have you ever seen or heard of the government fixing prices or wages, for example, bus fares, medicines, or minimum wages? Share an example and why you think it was done.
Yes, the government fixes minimum wages for workers.
Minimum wage means the lowest amount that a worker must be paid for their work. It is fixed to protect workers from exploitation and to ensure that they earn enough to meet basic needs. Another example is the fixing of prices of essential medicines. The government may control the prices of important medicines so that poor and middle-class people can afford them. Similarly, bus fares may also be regulated so that public transport remains affordable for ordinary people. Such steps are taken to promote fairness, welfare, and equal access to essential goods and services.
LET’S EXPLORE – Page 207
Q9From your surroundings, list two goods or services that are provided by the government. Choose one of the goods you listed and answer the questions.
Two goods or services provided by the government are: Roads
Streetlights
I choose streetlights.
Q10Who does benefit from it?
Everyone in the area benefits from streetlights. Students, workers, shopkeepers, drivers, pedestrians, elderly people, and women all benefit because streetlights make roads safer at night.
Q11Why would it be difficult for a private company to provide this service on its own?
It would be difficult for a private company to provide streetlights because it may not earn direct profit from everyone who uses them. People walking on the road cannot be charged separately every time they use the light. Also, some people may refuse to pay but still benefit from the streetlights. Therefore, private companies may not be interested in providing this service on their own.
Q12Imagine the government stops providing this good or service. What problems might people in your area face?
If the government stops providing streetlights, roads may become dark at night. This can increase accidents, theft, and fear among people. Students and workers may feel unsafe while returning home. Drivers may find it difficult to see clearly. Shops and local markets may also suffer because fewer people may come out at night. So, streetlights are an important public good provided for everyone’s benefit.
LET’S RECALL – Page 208
Q13According to you, how should a democratic government decide when and how much it should intervene in markets to protect people’s welfare?
A democratic government should intervene in markets only when intervention is necessary for public welfare. It should intervene when: Essential goods become unaffordable. Consumers are being cheated or exploited. Workers are being paid unfair wages. A monopoly is charging very high prices. There is hoarding or black marketing. Public goods are not being provided by private companies. Poor and vulnerable groups are badly affected.
However, the government should not interfere unnecessarily. Too much intervention can reduce producer motivation, increase rules and paperwork, and discourage business and innovation. Therefore, a democratic government should use a balanced approach. It should study the problem, consult people, listen to experts, and then take action that protects welfare without damaging production and innovation.
Q14Whose voices should a democratic government consider while making such decisions—consumers, producers, workers, or others? Why?
A democratic government should consider the voices of consumers, producers, workers, small businesses, experts, and vulnerable groups. Consumers should be heard because they are affected by prices and quality of goods. Producers should be heard because they produce and supply goods in the market. Workers should be heard because their wages and working conditions are important. Small businesses should be heard because too many rules can affect them badly. Poor and vulnerable groups should be heard because they suffer the most when essential goods become expensive. Experts should be heard because they can explain the economic effects of government policies.
A democratic government is accountable to the people. Therefore, it should make decisions after considering all groups, so that the policy is fair, practical, and beneficial for society.
Textbook solutions
Complete NCERT Questions and Activities – answers
Q1An increase in income always leads to a rise in demand for goods. Defend or refute, giving reasons for the same.
This statement is partly true but not always true. An increase in income usually increases the demand for many goods because people have more purchasing power. When income rises, people may buy better food, better clothes, mobile phones, vehicles, or other quality products. However, demand does not increase for all goods equally. For some basic goods, demand may remain almost the same because people already consume enough of them. For example, if a family’s income increases, they may not increase the consumption of salt or basic grains too much. Also, people may reduce the demand for low-quality goods and shift to better-quality goods. For example, after income rises, a person may buy branded shoes instead of ordinary shoes.
So, an increase in income generally increases demand for many goods, but it does not always lead to a rise in demand for every good.
Q2Demand for diesel cars
The demand for diesel cars may increase because petrol becomes very expensive. Some consumers may shift from petrol cars to diesel cars as an alternative. However, this also depends on the price of diesel and the cost of maintaining diesel cars.
Q3Demand for electric cars
The demand for electric cars may increase. If petrol becomes costly, people may prefer electric cars because they reduce dependence on petrol and may be cheaper to run in the long term.
Q4Demand for car accessories
The demand for car accessories may fall, especially for petrol car users. If petrol becomes expensive, people may reduce car usage and spend less on accessories like seat covers, music systems, decoration items, and other non-essential car products.
Q5Demand for public transport
The demand for public transport may increase. People may use buses, metro, shared autos, or trains to save money because travelling by petrol vehicles becomes costly.
Q6His cost of production
His cost of production will decrease in the long run. Drip irrigation reduces water use and saves labour. Although the farmer may spend money initially to install the system, later it helps reduce water, labour, and time costs.
Q7His willingness to supply at different prices
His willingness to supply will increase. Since drip irrigation increases yield by 30%, the farmer can produce more crops. Also, lower production cost means he can supply more even at lower prices and earn better profit.
Q8The overall market supply if many farmers adopt this technology
If many farmers adopt drip irrigation, the overall market supply will increase. More crops will be produced using less water. As supply increases, prices may fall if demand remains the same. This benefits consumers because goods become more available and affordable.
Q9During online festival sales, the prices of many products are very low. Use the concept of demand and supply to explain why sellers sell at such a low price. What happens to equilibrium when the price is lowered? Does this benefit only consumers or sellers as well?
During online festival sales, sellers reduce prices to attract more buyers. At lower prices, demand increases because more people become willing and able to buy products. Sellers may sell at low prices because they want to clear old stock, increase sales volume, attract new customers, compete with other sellers, and earn more total revenue through large-scale sales. When prices are lowered, the quantity demanded rises. If supply is sufficient, the market may move to a new equilibrium with lower price and higher quantity sold. This benefits consumers because they get goods at lower prices. But it can also benefit sellers because they sell more units, clear inventory, gain customers, and increase their market share. So, festival sales can benefit both consumers and sellers.
Q10Suppose the government sets a maximum sale price for an essential vaccine below the market-driven price. What is likely to happen?
Options:
- a. Surplus
- b. Shortage
- c. No effect
Q11Fall in demand
The correct answer is b. Shortage. If the government fixes the maximum sale price of an essential vaccine below the market price, the vaccine becomes cheaper for consumers. As a result, demand increases because more people want to buy it. However, producers may not be willing to supply enough vaccines at the lower fixed price because their profit may decrease. So, quantity demanded becomes greater than quantity supplied. This creates a shortage, also called excess demand. Therefore, when a price ceiling is fixed below the equilibrium price, shortage is likely to occur.
Q12The government levies higher taxes on products such as tobacco and alcohol to promote healthier choices. Can you find out other goods where price controls have been set in place? What are the reasons for the same?
Yes, price controls are used for many goods and services to protect people and promote public welfare. One example is essential medicines. The government may control medicine prices so that poor and middle-class people can afford them. Another example is public transport fares, such as bus or metro fares. These may be regulated so that ordinary citizens can travel at reasonable rates.
The government also fixes minimum wages for workers. This is not a product price, but it is a price control on labour. It ensures that workers are not exploited and receive fair payment for their work. During emergencies, the government may also control prices of essential goods like masks, sanitisers, food grains, or vaccines to prevent hoarding, black marketing, and overcharging. The main reasons for price controls are: To protect consumers To make essential goods affordable To prevent exploitation To stop hoarding and black marketing To ensure fairness and social welfare
Q13Can excessive government regulation hurt markets? Explain with suitable examples.
Yes, excessive government regulation can hurt markets. Government regulation is necessary to protect consumers, workers, and producers. But too much regulation can create problems. First, excessive price control can reduce producer incentives. For example, if the government fixes the price of wheat too low, farmers may not earn enough profit. As a result, they may reduce production, which can create shortages. Second, too many rules, licences, and permissions can create a compliance burden. For example, a small restaurant may need many permissions related to food safety, fire safety, pollution control, and local clearances. This increases cost and discourages small entrepreneurs.
Third, excessive regulation may discourage innovation. If producers cannot earn enough profit, they may not invest in better technology, new machines, or improved methods.
Therefore, government intervention should be balanced. It should protect public welfare without discouraging production, business, and innovation.
8. In the table below, different prices of guava are given.
Q14Think and write how much guava you and three friends will buy at each price.
A sample table is given below:
Price You Friend 1 Friend 2 Friend 3 Total ₹100/kg 1 kg 1 kg 0.5 kg 1 kg 3.5 kg ₹80/kg 2 kg 1.5 kg 1 kg 2 kg 6.5 kg ₹50/kg 3 kg 2.5 kg 2 kg 3 kg 10.5 kg ₹20/kg 5 kg 4 kg 3.5 kg 5 kg 17.5 kg
Q15Also make a graph for each one of you and one final graph for the total quantity.
To draw the graph, take price on the Y-axis and quantity on the X-axis. Plot the points for each person:
You: (1, ₹100), (2, ₹80), (3, ₹50), (5, ₹20)
Friend 1: (1, ₹100), (1.5, ₹80), (2.5, ₹50), (4, ₹20)
Friend 2: (0.5, ₹100), (1, ₹80), (2, ₹50), (3.5, ₹20)
Friend 3: (1, ₹100), (2, ₹80), (3, ₹50), (5, ₹20)
Total Demand: (3.5, ₹100), (6.5, ₹80), (10.5, ₹50), (17.5, ₹20)
The graph will show a downward-sloping demand curve, because as price falls, quantity demanded increases.
Q16Visit the nearby vegetable market and try to find answers to the
following questions.
Q17Who decides the prices of different vegetables in the vegetable market?
The prices of vegetables are mainly decided by the interaction of demand and supply. Wholesalers, retailers, farmers, transport costs, and customer demand all influence prices. If a vegetable is available in large quantity, its price falls. If supply is low and demand is high, its price rises.
Q18Sometimes the prices of a few vegetables are too high, and sometimes too low. Why is this?
Vegetable prices change because supply and demand keep changing. Prices may become high due to low production, bad weather, heavy rain, drought, transport problems, high demand during festivals, or shortage in the market. Prices may become low when there is bumper production, high supply, low demand, or when vegetables may spoil soon and sellers want to sell them quickly.
Q19The price of tomatoes is high in the morning and eventually gets lower by the evening. Have you ever noticed this? Comment.
Yes, this often happens in vegetable markets. In the morning, vegetables are fresh, and demand is high because many buyers come early. So, sellers charge higher prices. By evening, vegetables may lose freshness, and sellers want to clear their stock because tomatoes are perishable. If they do not sell them, they may spoil. Therefore, sellers reduce prices in the evening. This shows how demand, supply, freshness, and time affect prices.
Q20Categorise the following combination of goods into substitute goods and complementary goods.
Combination of Goods Category Reason
a. Movie ticket in the cinema Complementary They are often consumed
hall and popcorn goods together. Combination of Goods Category Reason
Complementary
b. Eraser and pencil Eraser is used with pencil. goods
One can replace the other c. Laptop and computer Substitute goods for many tasks.
d. Air Conditioner and cooler Substitute goods Both are used for cooling.
Complementary They are used together for
e. Notebook and pen
goods writing.
One fruit can replace the f. Apple and banana Substitute goods other.
Complementary Earphones are used with
g. Mobile and earphones
goods mobile phones.
Fig. 9.8 shows the demand curve DD’ and supply curve SS’. Based on
the figure, answer the following questions.
Q21What does point E represent in this market?
Point E represents market equilibrium. It is the point where the demand curve and supply curve intersect. At this point, quantity demanded is equal to quantity supplied.
Q22What is the equilibrium price and equilibrium quantity at point E?
Equilibrium price = ₹250 Equilibrium quantity = 30 kg At this point, demand and supply are equal.
Q23Point 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 represent?
Point A lies on the demand curve, so it shows the quantity demanded at the upper dashed price line. Point B lies on the supply curve, so it shows the quantity supplied at the same upper dashed price line. At the upper dashed price line, price is higher than the equilibrium price. At this high price, quantity supplied is more than quantity demanded. The gap between A and B represents excess supply or surplus. This means sellers are willing to sell more than buyers are willing to buy.
Q24Point 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 represent?
Point F lies on the demand curve, so it shows the
quantity demanded at the lower dashed price line. Point C lies on the supply curve, so it shows the quantity supplied at the same lower dashed price line. At the lower dashed price line, price is below the equilibrium price. At this low price, quantity demanded is more than quantity supplied. The gap between C and F represents excess demand or shortage. This means buyers want to buy more than sellers are willing to supply.
Q25If 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 will be excess demand or shortage. Many buyers will want the product, but sellers will not supply enough. In a free market, this shortage creates pressure on prices to rise. Sellers may increase prices because buyers are competing for limited supply. Gradually, the price will move upward toward the equilibrium point E, where demand and supply become equal.
Q26Draw 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
Q27Plot the demand and supply curve using the above data.
To draw the graph, take price on the Y-axis and quantity on the X-axis. Plot the following points for the demand curve: Demand Curve Points: (5, ₹10), (10, ₹20), (15, ₹30), (20, ₹40), (25, ₹50) Plot the following points for the supply curve: Supply Curve Points: (25, ₹10), (20, ₹20), (15, ₹30), (10, ₹40), (5, ₹50) Now join the demand points to form the demand curve and join the supply points to form the supply curve.
Q28Identify the equilibrium price and quantity.
Equilibrium occurs where: Quantity demanded = Quantity supplied From the table, at ₹30: Q.D. = 15 kg Q.S. = 15 kg So: Equilibrium Price = ₹30 Equilibrium Quantity = 15 kg
Q29Observe the above data and analyse what happens if the price is set at ₹20 or ₹40.
At ₹20:
- Q.D. = 10 kg
- Q.S. = 20 kg
- Here, supply is greater than
- demand. So, there is excess
- supply of 10 kg.
At ₹40: Q.D. = 20 kg Q.S. = 10 kg Here, demand is greater than supply. So, there is excess demand of 10 kg. Thus, only at ₹30 does the market reach equilibrium because demand and supply are equal at 15 kg.