Sheila and Bruce are going camping. They brought with them boxes of cookies (x) and bags of pretzels (y). Their utility functions and endowments are given in the table: Utility Function Endowment Sheila 0.5ln xS ln yS (16, 23) Bruce ln xB ln yB (12, 18) a) Calculate the MRS for each at their endowment. b) In an Edgeworth box diagram illustrate the endowment point and draw a sample set of indifference curves through the endowment point