The table shows the demand of two consumers for a good.
| Price (Rs) | Demand of A (units) | Demand of B (units) |
|---|---|---|
| 2 | 8 | 20 |
| 4 | 6 | 16 |
| 6 | 4 | 12 |
What is the market demand at a price of Rs 4?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 22 units
Given:
At Rs 4: demand of A = 6 units, demand of B = 16 units
Market demand at a price is the sum of the demands of all consumers at that price.
Market demand at Rs 4 = 6 + 16 = 22 units
Option (1) 16 units — this is only B’s demand at Rs 4.
Option (4) 28 units — this is the total in the Rs 2 row (8 + 20), not at Rs 4.
NCERT (2026-27): “2.5 Market Demand … The market demand for a good at a particular price is the total demand of all consumers taken together. The market demand for a good can be derived from the individual demand curves. Suppose there are only two consumers in the market for a good. Suppose at price p′, the demand of consumer 1 is q′1 and that of consumer 2 is q′2. Then, the market demand of the good at p′ is q′1 + q′2. … Thus, the market demand for the good at each price can be derived by adding up the demands of the two consumers at that price. If there are more than two consumers in the market for a good, the market demand can be derived similarly. …” |