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Good interpersonal relationships have a far greater effect on happiness than large raises in salary.

Is interpersonal in the above optional? Thanks.
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Angliholic:

Imagine:

Good business relationships have a far greater effect on happiness than large raises in salary.

How do you feel about it now?
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Hi,

All relationships between people are 'interpersonal'. That's what the word means.

I agree that, in this context, it's good to say 'business relationships'. It's more precise.

Clive
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Comments  
I do not think that interpersonal is optional. You can have several types of relationships. There could be a relationship between two lovers, between a brother and a sister, between an employer and employee, between an owner and a pet, between a person and non-living things, such as money. Here, the author wants to stress a specific type of relationship.
 Marius Hancu's reply was promoted to an answer.
 Clive's reply was promoted to an answer.
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