Questions: The equilibrium quantity of labor and the equilibrium wage increase when: - labor supply shifts to the right, if wages are flexible. - labor demand shifts to the right, if wages are flexible. - labor demand shifts to the left, if wages are flexible. - labor supply shifts to the left, if wages are flexible.

The answer is labor demand shifts to the right, if wages are flexible.

When the labor supply shifts to the right, it means there is an increase in the number of workers willing to work at each wage level. This typically leads to a decrease in the equilibrium wage because there is more labor available. The equilibrium quantity of labor would increase, but the wage would decrease, not increase.

When the labor demand shifts to the right, it indicates that employers are willing to hire more workers at each wage level. This increase in demand for labor leads to both an increase in the equilibrium quantity of labor and an increase in the equilibrium wage, assuming wages are flexible and can adjust to the new market conditions.

A leftward shift in labor demand means that employers want to hire fewer workers at each wage level. This would result in a decrease in both the equilibrium quantity of labor and the equilibrium wage, assuming wages are flexible.

When the labor supply shifts to the left, it means there are fewer workers willing to work at each wage level. This typically leads to an increase in the equilibrium wage because there is less labor available. However, the equilibrium quantity of labor would decrease, not increase.