Thought this was interesting, there's a research paper "Pettiness in Social Exchange" that found 81% of participants preferred to be friends with the person who paid back their friends in round numbers vs exact numbers because it felt less transactional

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@ted I feel like you'd find this interesting

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Ran into this immediately when I moved to Japan for college.

French classmate was aghast I paid him back for the bus ride he comped me for day 1.

Japanese people, on the other hand, seem to love the clarity of transactional gift giving and returning

there are some cultures where paying people back is a sign that you consider the relationship transactional and dont want to hang out again