State whether each of the following events will result in a movement along the market demand curve for labor in electronics factories in China or whether it will cause the market demand curve for labor to shift. If the demand curve shifts, indicate whether it will shift to the left or to the right and draw a graph to illustrate the shift.

a. The wage rate declines.

b. The price of smartphones declines.

c. Several firms exit the smartphone market in China.

d. Chinese high schools introduce new vocational courses in assembling electronic products.