Cory Nieves, 15: net worth at least $1 million (£769k)
Most kids have taken part in a bake sale and for six-year-old Cory Nieves the goal was simple: sell enough coffee and cookies so that he could buy his mum a car, because he was fed up of taking the bus to school. The biscuits were a particularly big hit and once he'd tried and tested his recipe to the point of perfection, Cory and his mum secured a commercial kitchen and the official brand of Mr. Cory's Cookies was born.