1. If unions are to be successful in obtaining wage rate increases for their members, they must be able to cause a shift in either the labour demand curve or the labour supply curve or both. i. Explain how craft unions try to change the DEMAND for their members' labour to cause an increase in wages, and job security. 2 Marks ii. Explain how industrial unions try to change the SUPPLY of their members' labour to cause an increase in wages while maintaining employment levels. 2 Marks ili. According to the Human Capital Theory, why do employers hire more educated workers? 1 Marks