The pattern where each extra unit of a good gives less additional satisfaction is the law of:

1. The first slice of pizza is worth more to a hungry person than the fifth. 2. Economists refer to this pattern as the law of diminishing marginal utility. 3. It means that as a person receives more of a good, the additional utility from each additional unit declines. 4. Total utility can still rise even while marginal utility falls. _Source: OpenStax Principles of Microeconomics for AP(R) Courses 2e (CC BY 4.0), Ch 2 'Choice in a World of Scarcity', sections 2.1-2.3_