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> What about when a mother kisses her baby's head? What about when a friend offers a hug to someone who has just lost a loved one? What about when a kid gives a friendly smile to the kid who always gets bullied?

Well, there are the obvious ones: evolutionarily beneficial responses. Still transactions, unconsciously working for the benefit of the species.

The others are more selfish. Obviously not angry or malicious, but they convey certain clear benefits for little to no effort. Definitely transactional.

Just because they are transactions, however, doesn't mean you have to weigh them in terms of some sort of emotional "profit", or they're in any way unwanted. It's just a way of talking about them, even modelling them for study.





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