Before ebooks became common, handing out free copies of a new tome was expensive. Each had to be printed and shipped, often with a nice handwritten note from the publicist inside (I love those). These days, everyone can afford to share their book, as the marginal cost of distributing a book in digital form is zero. Thus, it’s more than possible to now experiment with free books as a promotional tool for both the free title, for books in its series, and for an author’s larger collection of work. Buy one book by Author I Scool, and you might pick up another, if you liked it. Read the full story at The Next Web.