The following graph shows the demand curves for three consumers in the market, as represented by D, D' and D''. At a price of $45, the market quantity demanded for the good will be _____ units.
Figure 6.10

A)50
B)70
C)90
D)110
E)130

Question

The following graph shows the demand curves for three consumers in the market, as represented by D, D' and D''. At a price of $45, the market quantity demanded for the good will be _____ units. ​
Figure 6.10
​

A)50​ 
B)70 
C)90 
D)110 
E)130

Quizplus · Accepted Answer

At a price of $45, the quantity demanded by consumer D is 30 units, by consumer D' is 40 units, and by consumer D'' is 20 units. Therefore, the total quantity demanded in the market is 30+40+20 = 90 units.

The Following Graph Shows the Demand Curves for Three Consumers