reciprocity

“People are more willing to say yes to a request for something in return, the closer to the favor we've provided. However, when they have given us very large favors, those things stay in our consciousness. And years later, we will be willing to give back to the…”

“We are obligated to give back at the same level, but if the only thing we can do is to give back at a higher level, we will, to avoid the burden of feeling like a cheater, like a free rider, like a taker, an ingrate.”