““So imagine two scenarios. Let’s say it’s the holidays, and two different neighbors invite you to their parties in the same week. You accept both invitations. In one case, you do the irrational thing and give Neighbor X a bottle of Bordeaux; for the second party you adopt the rational approach and give Neighbor Z $50 in cash. The following week, you need some help moving a sofa. How comfortable would you be approaching each of your neighbors, and how do you think each would react to your request for a favor? The odds are that Neighbor X will step in to help. And Neighbor Z? Since you have already paid him once (to make and share dinner with you), his logical response to your request for help might be, “Fine. How much will you pay me this time?” Again, the prospect of acting rationally, financially speaking, sounds deeply irrational in terms of social norms. The point is that while gifts are financially inefficient, they are an important social lubricant. They help us make friends and create long-term relationships that can sustain us through the ups and downs of life. Sometimes, it turns out, a waste of money can be worth a lot.””
