Book superstore chains have been putting small bookshops out of business. “Ultimately, though, the greatest vulnerability of chains may be their muscle-bound nature. If print-on-demand technology, though still poky and faintly disreputable, ever achieves the availability and quality of traditional books, the need for overstock returns, remainders, and huge retail spaces may evaporate. Strange to say, someday superstores may be the historical curiosity that indies are now in danger of becoming.”