6. As individuals use additional quantities of a product, they begin to encounter ,resulting in a decline of extra satisfaction.

diminishing marginal utility

Explanation:

Utility can be defined as any satisfaction or benefits a customer derives from the use of a product or service.

In Economics, the marginal utility of goods and services is the additional satisfaction that a consumer derives from consuming or buying an additional unit of a good or service.

The law of diminishing marginal utility states that as the unit of a good or service consumed by an individual increases, the additional satisfaction he or she derives from consuming additional units would start decreasing or diminishing as the units of good or service consumed increases.

This ultimately implies that, as individuals use additional (extra) quantities of a product, they begin to encounter diminishing marginal utility, resulting in a decline of extra satisfaction.

For example, buying a candy stick and eating it may satisfy your cravings but eating another one (an additional or extra unit) wouldn't give you as much satisfaction as the first due to diminishing marginal utility.