Birth Order

What order are you? According to the Minneapolis Star Tribune, I, as an only child, am a quiet achiever, strategic thinker and in love, have trouble with conflict. Fairly true, at least more true compared to the Oldest, Middle, and Youngest definitions.

I wonder if there's a book about birth order and business? I.e., "How to Be Successful as an Only Child", "Leading a Brand as a Middle Child".