Every time we pay for something we experience what is called “The Pain of Paying”. When we pay any amount of money we feel some psychological pain. This is associated with giving up our hard earned cash. But it also turns out that this pain does not increase linearly with the cost. This means that when we double the payment, the pain doesn’t double – it only increases by a bit. In fact, the biggest increase in the pain of paying comes when we switch from paying nothing to paying something. Which means if you dine out with your friends, to reduce the pain of paying as much as possible, you shouln’t split the bill, instead take turns each time you go out. “The Pain of Paying” is a mysterious behavior that economists long tried to solve.