Class 11 Economics - ISC
Theory of Demand
The chapter 'Theory of Demand' in Class 11 ISC Economics introduces students to the foundational consumer behavior principles that drive market economies. It covers the definition of demand, individual versus market demand schedules, and the crucial distinction between utility and demand. Students will explore the Law of Demand, its underlying economic reasons, and key exceptions like Giffen goods and Veblen goods. Furthermore, the chapter details the distinction between shifts in demand and movements along the demand curve. Mastering this chapter is essential for ISC board exams as it forms the bedrock for consumer equilibrium, elasticity of demand, and supply analysis.
Start Learning FreeKey Concepts
Demand
Demand refers to the quantity of a commodity that a consumer is willing and able to buy at various given prices during a specific period of time.
Law of Demand
State that, other things remaining constant (ceteris paribus), there is an inverse relationship between the price of a commodity and its quantity demanded.
Movement along vs. Shift in Demand Curve
Movement represents a change in quantity demanded due to price changes (extension/contraction), while a shift represents a change in demand due to non-price factors (increase/decrease).
Giffen Goods
Inferior goods for which the Law of Demand fails, meaning an increase in their price leads to an increase in their quantity demanded.
Market Demand
The horizontal summation of individual demands of all consumers in the market for a particular commodity at various prices.
Important Formulas
Board Exam Info
In the ISC Class 11 Economics examination, this chapter typically carries around 8 to 12 marks. Common question types include numerical derivation of market demand schedules, graphical representation of shifts versus movements, and analytical questions explaining exceptions to the Law of Demand.
Frequently Asked Questions
What is the difference between an increase in demand and an extension of demand?
Extension of demand happens due to a fall in the price of the commodity itself, causing a downward movement along the same demand curve. An increase in demand happens due to favorable changes in non-price factors (like income or taste), causing a rightward shift of the entire demand curve.
Why does the demand curve slope downwards?
The demand curve slopes downwards due to the Law of Diminishing Marginal Utility, the income effect, the substitution effect, and the entry of new consumers when the price falls.
Are all inferior goods Giffen goods?
No, all Giffen goods are inferior goods, but not all inferior goods are Giffen goods. Giffen goods require a strong negative income effect that outweighs the substitution effect, which is rare.
Learn Theory of Demand with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards