"FOR AS LONG as there has been a publishing industry, there have been markets for used books — a supposedly quaint world of polymaths and antiquarians poking about musty, cluttered stores for titles few readers would know.
But a landmark study released this week confirms what publishers, authors and booksellers have believed — and feared — since the rise of the Internet: Used books have become a modern powerhouse, driven by high prices for new works and by the convenience of finding any title, new or old, without leaving your home.

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