Question One (25 Marks)
Julia uses two goods, X and Y. The utility function for Julia is given by the expression:
U = 10√x
The current prices of X and Y are RM25 and RM50, respectively. Julia's current income is RM750 per month.
Write an expression for Julia's budget line.
(3 marks)
Calculate the optimal quantities of goods X and Y that Julia should choose based on her budget line.
(5 marks)
Illustrate your answer in (ii) using a diagram (Good Y on the vertical axis).
(4 marks)
The government has increased the minimum wage to RM1000. As a result, Julia's income has increased to RM1000. At the same time, the price of good X has increased by RM3. Calculate the optimal quantities of goods X and Y that Julia should choose based on her new budget line.
(5 marks)
Calculate the total utility gained by Julia based on the optimal quantities of goods X and Y in (iv).
(3 marks)
Why can't an indifference curve have a positive slope? Show your answer using an appropriate diagram.
(5 marks)