It's not a "transaction", it's a relationship: they are never perfectly balanced. It's also hard to measure one's contribution in a relationship (hey, maybe th

It's not a "transaction", it's a relationship: they are never perfectly balanced. It's also hard to measure one's contribution in a relationship (hey, maybe they were a really good listener; or maybe they can't find time to help you move, but when your kids get sick, they'll move the world to get the best possible care for them?), so let's not go and introduce quick-and-simple rules for what definitely are relations on a case-by-case basis.