Exhibit 11-3 Labor supply curve A graph plots wage rate in dollars on the y-axis and quantity of labor on the x-axis. A horizontal labor supply curve, labeled S, intersects the y-axis at (0, 18). In Exhibit 11-3, the total wage cost of hiring 6 employees is: a. $3 per hour. b. $36 per hour. c. $108 per hour. d. $18 per hour