27. Use 2-diagrams, one for unionized and the other for non-unionized sector where both markets are initially in equilibrium. Show on the same set of diagrams the impact of an increase in wage in the unionized sector on both markets.

28. Use 2-diagrams, one for unionized and the other for non-unionized sector where both markets are initially in equilibrium. Assume that despite an increase in wages in unionized sector, the employment level is fixed in the unionized sector at the initial competitive equilibrium level. What would be the impact of an increase in wages on both sectors in this case? Explain