“The more honorable that restaurant work is in a society, the less that staff are tipped. Hence, Japan is one of the few countries in the world where tipping is actually offensive, because it is seen as dishonoring the server.” In some places tipping is considered mandatory. In other places it’s insulting. And everywhere, it’s mystifying to tourists, economists and anthropologists. (Once we go all-digital, the screen will tell you what to do.)