Refer to the Information Provided in Figure 13

Refer to the information provided in Figure 13.1 below to answer the questions that follow. Figure 13.1
-Refer to Figure 13.1. Which of the following can change the equilibrium wage rate from $9 to $15?

A) The value people put on their leisure time increases.
B) The value of what firms produce decreases.
C) The productivity of workers decreases.
D) the value of what firms produce increases.