Answer:
C. Marginal Utility is positive for the 4th slice, negative for 5th slice.
Explanation:
Total Utility is the total amount of satisfaction from consumption of all units of a good. Â TU = ÎŁMU
Marginal Utility is the additional satisfaction from consumption of an additional unit of a good. MU = TUn - TUn-1
As per Law of Diminishing Marginal utility: Â Consuming additional units of a good increases marginal utility by lesser magnitude than the preceding unit consumption.
A consumer consumes a commodity only if: It increases or atleast keeps constant its Total Utility i.e Total Satisfaction & It's Marginal Utility i.e Additional Satisfaction is positive or atleast 0.
Falling TU & negative MU implies the consumption of that unit is doing worse rather than good to consumer's satisfaction, so he/ she wont consume it.
So, in this case: refusing to consume 5th unit of commodity (Pizza) slice implies its MU i.e additional satisfaction will be negative & Total Utility i.e satisfaction would be falling. Â