I remember reading a pretty interesting book (Neo-Bohemia: Art and Commerce in the Postindustrial City) where the author found that a great proportion of the ti

I remember reading a pretty interesting book (Neo-Bohemia: Art and Commerce in the Postindustrial City) where the author found that a great proportion of the tip income among his study's subjects came from friends and associates who also worked in food and drink service--they were basically just passing cash back and forth.