(a) What are the causes of monopoly? Is monopoly desirable? (8marks) (b) With the use of examples, differentiate between positive and normative economics (5marks) (c) Differentiate between movements along a demand curve and a shift of demand curve and highlight the determinants of each case. Illustrate with diagrams. (d) Explain the goods that exhibit positive and negative elasticities of demand. (8marks) (4marks)