For a full hour, he poured lemonade. The world is a thirsty place, he thought as he nearly emptied his fourth pitcher of the day. And I am the Lemonade King.

Fourth-grader Evan Treski is people-smart. He s good at talking with people, even grownups. His younger sister, Jessie, on the other hand, is math-smart, but not especially good with people. So when the siblings lemonade stand war begins, there really is no telling who will win or even if their fight will ever end. Brimming with savvy marketing tips for making money at any business, definitions of business terms, charts,...