The rate of increase in utility is

The rate of increase in utility is referred to as marginal utility. Marginal utility is the additional satisfaction or benefit that a consumer gets from consuming an additional unit of a good or service. It is the change in total utility that results from a one-unit change in the consumption of a good or service. Marginal utility is an important concept in economics because it helps explain how consumers make choices about how much of a particular good or service to consume. As a general rule, consumers will continue to consume additional units of a good or service as long as the marginal utility they receive from each additional unit is greater than or equal to its price.