For anyone who wants to know more about the topic: Adam Grant (the author) has been doing a lot of work around this concept of "givers" as a personal trait and

For anyone who wants to know more about the topic: Adam Grant (the author) has been doing a lot of work around this concept of "givers" as a personal trait and how behaviors around the actions of giving/taking/matching results in various levels of success or early indicators for other things. This article is really a subset of his research applied to just this one case.