Sale-or-return book business under threat -- are single copy mags vulnerable?

There are rumblings in the book trade about the possible doom of the 80-year-old practice of book returns. And, for a business like magazine publishing where the single copy sales system follows much the same model, only with much higher returns, this may give pause.Starting in the Depression, publishers eager to keep booksellers in business and stocking their titles allowed bookstores to return