The author’s royalty — a subject of fierce debate between literary agents and publishing executives — is calculated among some of the large trade publishers as 25 percent of the gross revenue, while others are calculating it off the consumer price. So on a $12.99 e-book, the royalty could be anywhere from $2.27 to $3.25.

All that leaves the publisher with something ranging from $4.56 to $5.54, before paying overhead costs or writing off unearned advances.

At a glance, it appears the e-book is more profitable. But publishers point out that e-books still represent a small sliver of total sales, from 3 to 5 percent. If e-book sales start to replace some hardcover sales, the publishers say, they will still have many of the fixed costs associated with print editions, like warehouse space, but they will be spread among fewer print copies.

Moreover, in the current print model, publishers can recoup many of their costs, and start to make higher profits, on paperback editions. If publishers start a new e-book’s life at a price similar to that of a paperback book, and reduce the price later, it may be more difficult to cover costs and support new authors.

Another reason publishers want to avoid lower e-book prices is that print booksellers like Barnes & Noble, Borders and independents across the country would be unable to compete. As more consumers buy electronic readers and become comfortable with reading digitally, if the e-books are priced much lower than the print editions, no one but the aficionados and collectors will want to buy paper books.

“If you want bookstores to stay alive, then you want to slow down this movement to e-books,” said Mike Shatzkin, chief executive of the Idea Logical Company, a consultant to publishers. “The simplest way to slow down e-books is not to make them too cheap.”

In many ways, the $12.99-$14.99 price bracket for e-books is an experiment. With it, the publishers seem to have beaten back, for the moment, the $9.99 price that Amazon has offered for Kindle versions of most new releases and best sellers, but it remains to be seen whether consumers will tolerate that.