A fifteen-year-old who parlays his father's failing grocery store into a mercantile empire in less than a year is irresistible, and one who gets around the obstacle of school attendance by starting his own is also a hero, so the fact that Benny becomes as tiresome to the reader as he does to his friends and finally to himself may not matter -- they'll probably forgive him for the fun of seeing how he does it. Mostly it's a matter of self-education (in marketing, distribution, real estate, taxation), hiring the best people (including the local cop as a lawyer) and capitalizing on capitalist incentives; also round-the-clock application. Some of the consequences are hilarious, some are merely grotesque. . . . The boy wonder does widen his vision at the end reinstates Dad and reconsiders girls and school. With the title and the ploy-by-ploy and Mercer Mayer's drawings, you won't at any rate have to worry about business.