26. Which of the following is NOT an assumption that we make about consumer preferences? A Downward-sloping. B Completeness. C Non-satiation. D Transitivity. 27. Why can't indifference curves be upward-sloping? A It's a violation of the non-satiation principle. B It makes it impossible to calculate marginal utility. C It's a violation of the completeness principle. D All of these. 28. How is marginal utility defined? A The utility gained from consuming the first unit of a given good. B The derivative of utility with respect to the number of goods consumed. C The utility gained from consuming only one good. D The total utility gained from consuming a bundle of goods. 29. How does the marginal rate of substitution change as you move along a non-linear indifference curve? A It stays the same. B It increases. C It depends on the specific shape of the indifference curve. D It declines. 30. What is an appropriate intuitive explanation of the principle of diminishing marginal utility? A Consumers value more the first unit of any good they own, compared to the hundredth unit. B All of these. C Consumers have a preference for diversity in consumption. D Everyone gets tired of consuming the same thing eventually. 31. Which of the following concepts is equivalent to the marginal rate of transformation between two goods? A The rate at which you can turn one good into the other good in the marketplace. B The ratio of the prices of the two goods. C The slope of the budget constraint