Coke pretty much costs nothing compared to the rest of the operating costs. This is why many McDs have the price of all the fountain drink sizes the same. I'm g

Coke pretty much costs nothing compared to the rest of the operating costs. This is why many McDs have the price of all the fountain drink sizes the same. I'm guessing only a minority of people would come in for the free drink and leave without eating something. It's the same as the monopoly game pieces they give out. Many just have things like a free hashbrown, or fries, or a drink, small things. People aren't going to both waiting in line just for something small like that so either McDs doesn't lose anything when those people don't come back or they make a real sale when they come back and buy a burger with their free fries.