Michael Bloomberg is coming out with a new book, to be collaborated on with Margaret Carlson, who works for him, sort of, as a columnist for Bloomberg News.

It's not the first time that Bloomberg, who normally holds reporters in something like amused contempt, will have worked closely with a journalist from his company. On his first book, he worked with Matthew Winkler, a founder and editor in chief of Bloomberg News.

Meanwhile, Joyce Purnick, a non-Bloomberg writer, is scrambling to get a Bloomberg biography of the unauthorized variety on bookstore shelves before the mayor leaves office.