01 · Explore
The Concept of Demand
Demand is not merely a wish to own something; it is the willingness to buy a product backed by the actual ability to pay for it.
In economics, demand is defined as the quantity of a product that consumers are willing and able to purchase at a specific price. This depends on factors like individual needs, preferences, income, and even the current season. For instance, a desire for a luxury car only becomes 'demand' when the consumer has the purchasing power—a measure of how much one unit of currency can buy—to actually acquire it.
The Law of Demand describes an inverse relationship between price and quantity. When the price of a good rises, the quantity demanded typically decreases. Conversely, when the price falls, the quantity demanded increases. This happens because consumers tend to buy more of a product when it becomes cheaper and less when it becomes expensive, assuming other factors like income remain constant.
An individual demand schedule is a table showing how much of a product a single consumer will buy at different prices. When this data is plotted on a graph with price on the y-axis and quantity on the x-axis, it forms a downward-sloping line known as the demand curve. For example, if Srivalli buys 1 kg of mangoes at ₹150 but 3 kg at ₹50, her demand curve slopes downward to reflect this change.
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What is the difference between 'desire' and 'demand' in economics?
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What does the Law of Demand state?
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Sign inNew here? Sign up freeNCERT reference: chapter PDF page 2.
02 · Explore
Individual vs. Market Demand
While one person's choices form individual demand, the sum of all buyers in the market creates the market demand.
Market demand is the total quantity of a good that all potential buyers are willing to buy at various price levels. It is derived by summing up the individual demands of every consumer in that market. For example, if at ₹100, Srivalli wants 2 kg, Alex wants 4 kg, and Israt wants 6 kg, the market demand at that price is 12 kg.
The market demand curve is generally flatter than an individual demand curve. This is because market demand aggregates many consumers, meaning a small change in price results in a much larger total quantity response from the entire group of buyers compared to a single person. When the price falls from ₹150 to ₹50, Srivalli's demand might increase by 2 kg, but the total market demand could increase by 12 kg.
| Price (₹) | Srivalli (kg) | Alex (kg) | Israt (kg) | Market Demand (kg) |
|---|---|---|---|---|
| 150 | 1 | 2 | 3 | 6 |
| 100 | 2 | 4 | 6 | 12 |
| 50 | 3 | 6 | 9 | 18 |
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How is market demand calculated?
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03 · Explore
Factors Influencing Demand
Price is not the only factor that changes how much people buy; related goods, income, and tastes play major roles.
Demand is heavily influenced by the price of related goods, categorized into substitutes and complements. Substitute goods can replace each other, like tea and coffee; if the price of coffee rises, people may switch to tea, increasing tea's demand. Complementary goods are used together, like cars and petrol; if petrol prices rise, the demand for cars might fall.
Consumer income also shifts demand. When income rises, people feel more confident and can afford more or higher-quality goods even if prices stay the same. Additionally, the 'diminishing marginal utility' principle suggests that as we consume more of a product, the extra satisfaction we get from each additional unit decreases, which eventually lowers our willingness to pay more for it.
Other factors include seasonality (e.g., high demand for sweaters in winter), tastes and preferences, and future price expectations. If people expect prices to rise next month, they might buy more now, increasing current demand. Population size and composition also matter; for instance, more elderly people in a population increases the demand for orthopedic shoes.
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What is the principle of diminishing marginal utility?
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04 · Explore
The Law of Supply
Supply represents the quantity of a product that sellers are willing and able to offer at different prices.
The Law of Supply states that there is a direct relationship between price and quantity supplied. As the price of a product increases, the quantity supplied also increases. This is because higher prices offer higher profit margins, which encourages existing producers to increase their output and attracts new firms to enter the market.
An individual supply schedule shows the quantity a single seller offers at various prices, resulting in an upward-sloping supply curve. Market supply is the sum of all individual supplies from all sellers. For example, if three sellers (A, B, and C) offer 1 kg, 3 kg, and 2 kg respectively at ₹50, the market supply is 6 kg.
Supply is also affected by the price of related goods. If a farmer finds that chickpeas are more profitable than wheat due to higher prices, they will grow more chickpeas and less wheat. Technology also plays a role; improvements like drip irrigation and weather sensors can reduce production costs and increase crop production, allowing producers to supply more at the same price. Cold storage facilities also help in transporting goods like mangoes to distant markets, increasing market supply.
Calculating Market Supply
QS = Seller A + Seller B + Seller C
At a price of ₹100, Seller A supplies 2 kg, Seller B supplies 4 kg, and Seller C supplies 6 kg. The total market supply (QS) is 2 + 4 + 6 = 12 kg.
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Why does the supply curve slope upwards?
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