Gr 4-7--At the beginning of summer vacation, the 12-year-old narrator wonders how he is going to get enough money to buy a new inner tube for his bike. Grandma comes to the rescue when she gives him her late husband's riding lawn mower and he starts mowing a few yards in the neighborhood. Within a month, he has 15 people working for him and more business than he can handle. Arnold, one of his customers and a home-based stock broker, invests some of the boy's earnings not only in the stock market but also in a prizefighter, helping him earn thousands of dollars. Gary Paulsen's enjoyable novel (Wendy Lamb Books, 2007) also offers lessons on how a free-market economy works, buffered by lots of wacky humor and the inclusion of improbable and unexpected events. Tom Parks does an excellent job of conveying the innocence and unbridled enthusiasm of the young man. However, the protagonist sounds younger than 12 and a Latino character sounds somewhat robotic. In spite of these quibbles, this is a fun and educational audiobook.--Wendy Woodfill, Hennepin County Library, Minnetonka, MN[Page 60]. Copyright 2008 Reed Business Information.