It can be as simple as a lemonade stand. It can be a family affair if you have a business of your own. It can even be a formal school group project where your child is to come up with a product, build it, market it and write about the results. The opportunities abound for children to learn about the world of business and its intricacies. And there is ample reason to do so as well. Consider what they get from the experience.
First, they get an understanding of what is needed to make a business work. Obviously, this is important for an entrepreneur, but even if they end up working for someone else, they will have an understanding of how their job plays a role in the success of the business and that will give them motivation to do well and insight into how to do their jobs better. They will also have an understanding about the ethics of work and strive to earn the money they are paid.
If they do become involved in entrepreneurism, they will have a good understanding of what they will need to do to succeed. They will understand what needs to go into a business, why various aspects such as marketing, accounting and customer service are all important and how to provide each for their companies. In short, they will be well prepared for what is needed to succeed in business and provide a useful product or service to our society. They may even make the world a better place in the process.