How Do Businesses Create Wealth?

The richest people in the world made their money by making those businesses worth more than they cost to create. There's no book that I know of written about businesses, how do businesses create wealth? That's the idea. Basically, how do the richest people get there? That's what you get. And it means that when you're selling a business, it's a very personal decision for people and they're doing it because they don't have successors.