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How does an author’s inscription increase a book’s desirability?

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In the context of book collecting, an author’s inscription significantly enhances a book's desirability by transforming it into an "association copy."1

These copies are highly prized because they provide a tangible, personal connection to the author or other prominent individuals who previously owned and used the volume. While factors like rarity and physical condition are fundamental to a book's value, the presence of an inscription or annotations adds a unique historical and personal dimension that often drives competition among collectors. Consequently, entire collections are frequently built around these association copies, as they offer a deeper level of significance beyond the text itself.1