My wife Kristin asked him if he made it himself. He said yes. I was tempted to point out the fact that there as a bottle of store bought lemonade sitting on the cooler, but I figured if a little marketing white lie was good enough P&G, it's good enough for 7-year-old street corner lemonade vendors.
I'm not sure if it's the business lesson I'd want him to learn, but perhaps it will make him a more wary consumer in the future. Enjoy the $1 kid.