Mass market paperbacks used to be the most popular reading format in the world, with hundreds of millions of copies sold in their hay day of the sixties through to the eighties.
Last year one of the largest US distributors announced it was stopping distributing them.
Esther Margolis is the founder and publisher of Newmarket Books in New York, with a long career in selling books, including as a senior executive at Bantam Books, one of America's major publishing houses.
She spoke to Emile Donovan from her home in New York.
Photo: CC BY 2.0 / Ginny
