Final answer:
In the scenario where chief's relatives choose their own mates while others have arranged marriages, the practice is an example of a particularistic norm, which applies to specific individuals within the society.
Step-by-step explanation:
In the described situation where relatives of the chief are allowed to choose their own mates, while others must follow arranged marriages, we are observing a particularistic norm. This term describes a cultural rule that is specifically applied to or expected from certain individuals within a society, rather than being a universal expectation applied to all members of the culture impartially. In contrast, a universalistic norm would be a rule or standard that is applied equally to all members of a society, regardless of their social status or relationship to a leader.
The presence of arranged marriages and exogamous or endogamous unions varies across cultures and often reflects the underlying social and economic structures of a community. American and European cultures tend towards monogamy and the choice of marital partners based on love and compatibility, but other cultures may prioritize different values in their marriage customs.