Kidpreneurs?

 Check out Kickstarter. Some kids sell all sorts there 

Also what's very important to note is demand and supply. If you go to one of those pop up market events, you'd realize that people love making crafts nobody wants to buy. It's a huge waste of effort and a great disappointment to the kids who did it.

I am about to start teaching business to kids in the library. The first thing they need to know is what God wants them to do. How can the business they come up with make this world a better place? Don't come up with another McDonalds or Coke that destroys our health. But the marketplace is a ministry. And how is that going to be beneficial to society? We do need to make profit like how Isaac makes a hundredfold and like how the stewards made five talents and ten talents. But our intention is not a money making scheme as such but more of a role of fulfilling our calling and ministering to the lost, even feeding the hungry, eradicating poverty, drawing people to God in introducing them to God like how Narnia was written, or just improving the health of the people and standards of living.