There are four consumers of a fruit called a smile. They are Isla, Ifraah, Ila and Ibema. Their demand curves for smile are given below. Derive the market demand curve.
Price (Rs.) Quantity Demanded by Isla (Units) Quantity Demanded by Ifraah (Units) Quantity Demanded by Ila (Units) Quantity Demanded by Ibema (Units)
$1$
$2$
$3$
$4$
$5$
$6$ $16$
$11$
$7$
$4$
$2$
$1$ $7$
$6$
$5$
$4$
$3$
$2$ $15$
$12$
$9$
$6$
$3$
$0$ $8$
$6$
$4$
$2$
$0$
$0$

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Solution

In order to draw a market demand curve, we must first derive a market demand schedule, as under:
Market Demand Schedule
Price (Rs.) Quantity (Units)
$1$
$2$
$3$
$4$
$5$
$6$ $16 + 7 + 15 + 8 = 46$
$11 + 6 + 12 + 6 = 35$
$7 + 5 + 9 + 4 = 25$
$4 + 4 + 6 + 2 = 16$
$2 + 3 + 3 + 0 = 8$
$1 + 2 + 0 + 0 = 3$
Note: Market demand curve is a horizontal summation of individual demand curves.

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Price (Rs.)	Quantity Demanded by Isla (Units)	Quantity Demanded by Ifraah (Units)	Quantity Demanded by Ila (Units)	Quantity Demanded by Ibema (Units)
$1$ $2$ $3$ $4$ $5$ $6$	$16$ $11$ $7$ $4$ $2$ $1$	$7$ $6$ $5$ $4$ $3$ $2$	$15$ $12$ $9$ $6$ $3$ $0$	$8$ $6$ $4$ $2$ $0$ $0$

Price (Rs.)	Quantity (Units)
$1$ $2$ $3$ $4$ $5$ $6$	$16 + 7 + 15 + 8 = 46$ $11 + 6 + 12 + 6 = 35$ $7 + 5 + 9 + 4 = 25$ $4 + 4 + 6 + 2 = 16$ $2 + 3 + 3 + 0 = 8$ $1 + 2 + 0 + 0 = 3$

In order to draw a market demand curve, we must first derive a market demand schedule, as under:Market Demand SchedulePrice (Rs.)Quantity (Units)12345616+7+15+8=4611+6+12+6=357+5+9+4=254+4+6+2=162+3+3+0=81+2+0+0=3Note: Market demand curve is a horizontal summation of individual demand curves.