Joe the Plumber, Small Business, and a Good Question

A commenter has asked an interesting question about the relationship between small business income and the number of workers in these firms. The FactCheck.org item Len Burman and Eric Toder cited in their blog post this morning reports that 20 million small businesses—many sidelines businesses or hobbies—;have no employees at all besides the proprietor. But it would be good to learn more about the rest. We’d like to hear from any of you who have other data or thoughts about this question.