When marginal utility is negative, total utility is decreasing.

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Marginal utility is the additional satisfaction or benefit that a consumer receives from consuming an additional unit of a good or service. When marginal utility is negative, it means that consuming an additional unit of the good or service actually decreases the total satisfaction or benefit that the consumer receives. Therefore, total utility is decreasing. Marginal utility refers to the additional satisfaction or benefit one derives from consuming an additional unit of a good or service. When it becomes negative, it means that the consumer is experiencing a decrease in satisfaction from the last unit consumed. This will result in a decrease in the total utility, which is the overall satisfaction derived from consuming all units of the good or service. Therefore, when marginal utility is negative, total utility is decreasing.

When Marginal Utility Is Negative, Total Utility Is Decreasing