It's a simple book trying to tell a complex financial story, and it does a pretty good job. A 12-year old boy gets a ride-on lawn mower for his birthday. Through happenstance, he ends up spending the summer mowing lawns, and due to some neighborhood politics, quickly grows his business to a staggering level, makes tons of money, and learns about the beauty of a stock split.
This quick, under 100-page story gives kids a high-level idea of business (glossing over things like taxes and undocumented workers), but also has a bit of a dark side when a competitor wants to strong-arm the narrator out of his territory only to be thwarted by a professional boxer with a soft spot for his sponsor.
This leads to some fight scenes in the last sections of the book (some presented in a slapstick manner, some not) that raises the reading level for me a bit (School Library Journal lists it as Grades 4-7 which is a rather wide range if you ask me).
That said, it's an entertaining look at how a little money can make a lot of money if you know what you're doing... or if you can partner with someone who does. 3 bookmarks.