Final answer:
In the field of economics and the study of society, the term 'tertiary' is used to refer to the third level or rank, but it can sometimes be the fourth link. This is because of historical and common naming conventions in certain contexts.
Step-by-step explanation:
The term 'tertiary' is used in various contexts to refer to the third level or rank, but it can sometimes be the fourth link. This is because of historical naming conventions and common naming conventions in certain contexts.
For example, in the field of economics and the study of society, there is a classification of economic activities into four sectors: primary, secondary, tertiary, and quaternary.
Each sector has a different focus, with the tertiary sector providing services and the quaternary sector producing ideas and high-level education and the arts.