Which Market?

We've been learning about different types of children's book markets, in both of my classes, and it seems every time I think I've got them straight, I find I am wrong once again!  So which is it- School & Library, Trade Book, or Mass Market?  It is time for me to get it right, once and for all!

In my search for the Truth, I have found an excellent breakdown of the children's book market via a very cool website called "The Purple Crayon."  Click here to see the article.

I recently purchased this cute little book at BJ's, because I fell in love with the illustration, and the story.  It is a squishy hardcover board book, and I think it would be considered a Mass Market book.  Either way, it's super cute!