The Demand and Supply Curves Shown Below Apply to a Competitive

Multiple Choice

The demand and supply curves shown below apply to a competitive market for a factor used in the production of widgets. FIGURE 13-2
-Refer to Figure 13-2.This factor market is initially in equilibrium at point B,but changes occur that cause the equilibrium to shift to point D (S curve shifts left) .At the new equilibrium,total factor earnings ________ compared to the initial equilibrium.

A) decreased by $30
B) increased by $30
C) remained the same
D) increased by $10
E) increased by $330