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Question
If total utility is maximum at a point, then marginal utility is
Options:
A .  positive but decreasing
B .  positive
C .  zero
D .  negative
Answer: Option C
Answer: (c)
Marginal utility of a good or service is the gain (or loss) from an increase (or decrease) in the consumption of that good or service.
As the rate of commodity acquisition increases, marginal utility decreases. If commodity consumption continues to rise, marginal utility at some point falls to zero, reaching maximum total utility.
Further increase in consumption of units of commodities causes the marginal utility to become negative; this signifies dissatisfaction.

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