Template:Reciprocity capsule

The idea is if you receive a gratuity — even a tatty flower you didn’t want, pressed on you by a glassy-eyed hippy when you least needed a free fricking flower, struggling through arrivals with three suitcases and a rolled-up Turkish carpet your spouse bought on impulse — you still feel morally obliged to reciprocate somehow. If you are in the middle of a sales pitch, the obvious way of doing that is buy buying the product.