Notes Chapter 9 Class 9 Social Science CBSE Board

The Price Puzzle: What Drives the Market

1. Demand

• Demand is the quantity of a product that people are willing and able to buy at a particular price.
• It depends on needs, preferences, season, trend, and income.
• Demand is not just desire — it requires purchasing power.

Law of Demand

• When price rises, quantity demanded falls.
• When price falls, quantity demanded rises.
• There is an inverse relationship between price and quantity demanded.

Individual Demand

• Quantity one consumer wants to buy at different prices (other factors constant).
• Shown in Demand Schedule (table) and Demand Curve (downward sloping graph).
• Example: Srivalli buys 1 kg mangoes at ₹150, 2 kg at ₹100, and 3 kg at ₹50.

Market Demand

• Total quantity demanded by all buyers at different prices.
• It is the sum of all individual demands.
• Market demand curve is flatter than individual demand curve because many consumers respond together.

2. Other Determinants of Demand

( Factors other than own price )

1.Price of Related Goods

• • Substitute Goods: Can replace each other (e.g., tea & coffee, mangoes & bananas). If price of one rises, demand for
    substitute increases.
  • Complementary Goods: Used together (e.g., smartphones & earphones, cars & petrol). Demand for one affects the other.

2.Income of the Consumer

• • Higher income → people buy more goods or better quality goods.

3.Taste and Preference of the Buyer

• • Personal likes and dislikes determine demand.

4. Population

• • Size and composition affect demand (more children → demand for sports shoes; more elderly → demand for
    orthopaedic shoes).

5.Seasonality

• • Demand changes with weather, festivals, and cultural habits (e.g., books at new session, sweaters in winter).

6. Future Price Expectations

• • Expected price rise → buy now (demand increases).
  • Expected price fall → postpone buying (demand decreases).

7. Diminishing Marginal Utility

• Additional satisfaction from each extra unit decreases → willingness to pay falls.

3. Supply

• Supply is the quantity of a product that sellers are willing and able to offer at a particular price.
• Law of Supply: Higher price → higher quantity supplied (direct relationship) because of more profit.

Individual Supply

• Quantity one seller offers at different prices.
• Shown in Supply Schedule and Supply Curve (upward sloping).

Market Supply

• Total quantity supplied by all sellers.
• Sum of individual supplies.
• Market supply curve is upward sloping.

4. Other Determinants of Supply

• Price of Related Goods
  • Producers shift to more profitable alternatives (e.g., farmer grows more chickpeas if its price is higher).
• Number of Sellers
  • More sellers → higher supply and lower prices.
  • Fewer sellers → lower supply and higher prices.
• Technology
  • Better technology reduces cost → increases supply (e.g., drip irrigation, cold storage).
• Future Expectations
  • Expected higher demand → increase production.
  • Expected lower demand → reduce production.

5. Market Equilibrium

• Market Equilibrium is the point where quantity demanded = quantity supplied.
• No excess demand (shortage) and no excess supply (surplus).
• Equilibrium Price and Equilibrium Quantity are determined here.
• Market is “cleared” and price is stable.

Real World Reality

• Markets are dynamic and constantly changing.
• Equilibrium keeps shifting due to changes in technology, weather, income, pandemics, etc.
• Example: COVID-19 mask demand increased sharply → prices rose → supply increased later → prices fell.

Hotel Tariffs Example

• Room prices change frequently based on season, demand, events, bookings, and competition.

6. Role of Government in the Economy

• Government intervenes because markets may not be fair (essentials become unaffordable for poor).

Regulation of Unfair Practices

• Price Ceiling: Maximum price (e.g., on medicines).
• Price Floor: Minimum wage or price.
• Controls Monopoly (single seller dominating market).

Provision of Public Goods

• Goods available to all (roads, parks, street lights, defence, sanitation).
• Private companies do not provide them because no direct profit.
• Government provides for welfare and equal access.

Limitations of Government Intervention

• Price distortions → reduced production and shortages.
• Too many rules → compliance burden on businesses.
• Discourages innovation and entrepreneurship.

These notes are strictly topic-wise as per the chapter, in easy English, and contain only content from the provided
document.