Jack Squat is eleven years old. He's got messy hair, one perpetually untied shoe, and a wallet so empty it's basically just a folded piece of leather. There's a sign on his bedroom wall that says "FUTURE MILLIONAIRE?" with a very large question mark.
He's not the smartest kid in the room. He's not the most organized (that's his best friend Freckles). He doesn't have a plan, a strategy, or a head start. What he does have is a refusal to just shrug and say "I don't know how any of this works."
Jack is the kid who keeps asking "but WHY?" until he actually gets a real answer even when the adults around him would rather just take a nap on the porch. He learns by doing, by failing, and occasionally by losing 75 cents on a lemonade stand he thought was going to make him rich.
He's also the kid who, once he figures something out, can't believe nobody told him sooner. Which is kind of the whole point.