I was reading the "My Dad taught me cash flow" (http://news.ycombinator.com/item?id=3167630) article and I thought "I bet kids couldn't do that in the UK." So I had a quick search, and it turns out that some places in the US are cracking down.
But why? What is the risk here? I'm not asking about the actual risk, but what the perceived risk is from 7 year olds selling lemonade at 25c per cup.