Now that they’ve made some money, Ethan and Emily Tuttle begin to wonder how they can put it to good use and earn even more. So the idea of a Children’s Entrepreneur Market is born, which can help them find other kids who might want to borrow their money to build their small business.

But as the twins soon learn—thanks to the ideas from Human Action by Ludwig von Mises—this is risky business. People have different incentives for why they make the choices they do, and certain choices can cause their market to become messed up!