Give the definition of the marginal rate of substitution. b. Give the definition of indifference curve. c. Hai Ying loves chestnuts but despises strawberries - chestnuts are a "good" for her and strawberries a "bad." Draw a graph of 3 of her indifference curves, labeling them with U1 < U2 < U3, with strawberries on the horizontal axis and chestnuts on the vertical axis. Explain how you know how what shape to give these. Describe and interpret the marginal rate of substitution in this situation. d. Rebecca hates Red Bull but consuming chewing gum has no effect at all on her well-being - Red Bull is a "bad" for her and gum a "neutral." Draw a graph of 3 of her indifference curves, labeling them with U1 < U2 < U3, with gum on the horizontal axis and Red Bull on the vertical axis. Explain how you know how what shape to give these. Describe and interpret the marginal rate of substitution in this situation.