Having expanded his summer lawn mowing job into an ever-growing business conglomerate, a twelve-year-old boy gets involved in high finance thanks to his hippie stockbroker, takes on sponsorship of a boxer, and becomes a media sensation.

When eleven-year-old Matt must set up a business to save his failing math grade, he overcomes his self-doubt and also gains two friends along the way.

Kate MacKinstrey explains how her friend went from being a poor sixth-grader to an eighth-grade millionaire by making a cheaper, better toothpaste--with her help.

Although his father has forbidden it, Ernie, a twelve-year-old business tycoon, makes a tidy profit in the pet funeral business, but when he refuses to give his star employee a raise and the business starts to fall apart, it takes the death of his own dog to bring everyone back together.

Henry Reed keeps a journal of his summer activities which include setting up a research firm and embarking on a series of usually profitable projects with the aid of his ally and neighbor Midge.

After her father goes to jail, Cady Bennett, twelve, is taken from foster care to spend a summer with her estranged Aunt Michelle, trying to save her failing pie shop.

Inspired by her grandparents' bakery and her recent visit to Paris, nine-year-old Grace leads her friends in starting La Petite Patisserie, making and selling French pastries at school and special events, but they soon discover that starting a new business is not always easy--or fun.

"Twelve-year-old Colophon Letterford has a serious mystery on her hands. Will she discover the link between her family's literary legacy and Shakespeare's tomb before it's too late?"--

Twins Bick and Beck Kidd and their family of professional treasure hunters race against mercenaries, rival treasure hunters, and a lumber baron through the jungles and mountains of Peru in search of Paititi, the legendary lost Inca city of gold, in hope of conserving the archaeological treasure and preventing deforestation of the rain forest.

When his family's restaurant and Cuban American neighborhood in Miami are threatened by a greedy land developer, thirteen-year-old Arturo, joined by Carmen, a cute poetry enthusiast, fight back, discovering the power of poetry and protest through untold family stories and the work of José Martí.