1.

Suppose there are two consumers in the market for a good and their demand functions are as follows: d1(p) = 20 - p for any price less than or equal to 20, and d1(p) = 0 at any price greater than 20. d2(p) = 30 - 2p for any price less than or equal to 15 and d1(p) = 0 at any price greater than 15. Find out the market demand function.

Answer»

d1(p) = 20 - p {p≤ 20, p > 20

d2(p) = 30 - 2p{p ≤ 15, p > 15

For price less than Rs 15 (≤ 15)
Market demand for a good = d1(p) + d2(p)

= 20 – p + 30 – 2p
= 50 – 3p
For price more than Rs 15 but less than Rs 20(15 < p ≤ 20)

Market demand = d1(p) + d2(p)

= 20 – p + 0(∵ for p > 15, d2(p) = 0)
= 20 – p
For price more than 20 (p>20)

Market demand = d1(p) + d2(p)

= 0 + 0(∵ for p > 10, d1(p) = 0, d2(p) = 0)

= 0

Thus, market demand

= 50 - 3p if p ≤  15

= 20 - p if 15 < p ≤  20

= 0 if p>20



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