Carl A. Boyle, a sales representative, was driving home when he saw a group of young children selling Kool-Aid on a corner in his neighborhood. They had posted the typical hand scrawled sign over their stand: "Kool-Aid, 10 cents." Carl was intrigued. He pulled over to the curb. A young man approached and asked if he would like strawberry or grape Kool-Aid. Carl placed his order and handed the boy a quarter. After much deliberation, the children determined he had some change coming and rifled through the cigar box until they finally came up with the correct amount. Th…