To induce a feeling of obligation. I accepted a gift, now I should give a gift in return. This way, they trade a ten cent ring and ask for a 10 euro note in r

To induce a feeling of obligation. I accepted a gift, now I should give a gift in return. This way, they trade a ten cent ring and ask for a 10 euro note in return. She tossed the ring on the ground so it clattered and jumped up, "is this yours? Oh, well you keep it...", you know, that kind of crap.