It is as American as apple pie, and a rite of passage for millions of young people: every summer, children set up lemonade stalls in front of their homes or in parks, selling their wares and learning some of the tricks of sales and marketing.
But in recent years, health and safety concerns have seen police asking for a growing array of permits. In August 2015, comedian Jerry Seinfeld's family was ordered by police in the Hamptons to shut down a lemonade stand, owing to local regulations. Now the parents are fighting back.
Jennifer Knowles' three boys were selling lemonade in Denver, Colorado, when a policeman told them they needed three separate permits - leaving William, the four-year-old "marketing manager", in floods of tears.
She has since founded advocacy group Lemonade Stand Mama, started a petition to change local laws and been interviewed on national TV.
"I'm trying to make lemonade stands legal across my community and ultimately across the country," she told CBS News.