It’s a variation of a basic rule called reciprocity — as identified by Robert Cialdini in his book, Influence. Every society adheres to some form of reciprocity — it helps cement relationships. It’s useful to know that, if you do someone a favor, you’ll likely be repaid in the future.
The reciprocity principle may seem obvious. But there are many subtleties and variations. Learn three of the major variations — and how to get a sports car — in this week’s video.