I was originally thinking about delivery (isn’t it basically the same effort to deliver 1 or 2 pizzas?). Shouldn’t delivery tipping be based on distance/effort rather than cost of food?
The same goes for restaurants, of course. If I go with a friend and we have the same meal but I have three glasses of wine, and she has three cokes, I am expected to tip more, but the server’s effort is the same for each of us.
Was it always like this or did it change with time?
Note: I’m only trying to understand this aspect of Us tipping culture. I know that tipping isn’t the norm everywhere.