b) Can a fixed-proportions production function exhibit be increasing or decreasing returns to scale? Draw the isoquant map in each case? (5 marks) c) Why is it that an increase in output must always increase total cost? Use diagrams where appropriate. (5 marks) d) In considering the market for factors of production, which group of economic agents are the demanders? Explain the main assumptions associated with this group's demand behavior. (5 marks) Question 2