I went to a student's house the other day, and instead of working the normal one hour with her, I only worked half an hour. When I got home, I realized she had actually paid me for the entire hour. Well, that's not fair. I decided to tell her. So when I went back to her house, I told her, "By the way, you paid me more than you should have last time." "Oh, Pontia, please!" she replied. I told her that I didn't want to offend her or anything, but I just thought I should bring it up. Maybe it was the American in me that thought, hesāb hesābe, business is business. She just laughed and said, "Hesāb hesābe, kākā barādar," business is business and a brother a brother.
People from Shiraz say kākā to mean barādar, brother. So this proverb says that business is business in the same way that kākā is barādar.