(a) Given marginal cost (MC), average total cost (ATC), average variable cost (AVC) and average fixed costs (AFC). Show how the curves would appear in one diagram and explain. (5marks) (b)Indifference curve do not intersect. Explain using a relevant diagram. (5marks) (c) Why are externalities so important in welfare economics? Explain how production of private and public goods generates externalities and affects economic welfare of people at large. (6marks) (d)Explain the main causes of monopoly market in an economy. (4marks) (e) A monopoly firm produces two goods for which the demand functions are given as: P-36-3q1, and P2-40-5q2. The joint cost function for production of these goods is given as C=q1+2q192+3q22. Determine the quantities of goods and their prices that maximize the profit of the firm and find the optimum profit. (5marks)