What is marginal utility if total utility is falling?

BlackTom题目解析

Question

What is marginal utility if total utility is falling?

BlackTom题目解析

BlackTom AI · Accepted Answer

The question asks: What is marginal utility if total utility is falling?
Option 1: negative
Reasoning: Marginal utility is the additional satisfaction from consuming one more unit, mathematically the change in total utility (ΔTU/ΔQ). If total utility is falling, each additional unit reduces total utility, so the marginal utility is negative. This reflects a decreasing total satisfaction with extra units.

Option 2: positive
Reasoning: If marginal utility were positive, each additional unit would increase total utility. That would require total utility to be rising with quantity, not falling. Therefore this option contradicts the given condition that TU is decreasing.

Option 3: not changing
Reasoning: If total utility were not changing, the change would be zero, so marginal utility would be zero. But a falling total utility implies a negative change, not zero, so this option is inconsistent with the scenario.

Option 4: zero
Reasoning: Zero marginal utility would mean a flat TU curve at that point, with no gain or loss from the next unit. Since the total utility is stated to be falling, the marginal change cannot be zero; it must be negative. This option does not align with the situation described.

What is marginal utility if total utility is falling? BlackTom题目解析

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