Kristin Masters reports:
"How much is a baseball worth? Maybe a dollar or two, right? Get that same baseball signed by Alex Rodriguez, and you have a collectible item. If that baseball happened to be a [home run] ball, [you’'ve] hit the jackpot! Signatures and autographs in books work much the same way. The rarity of both the book and the signature help[s] determine the value of a book...Not all signatures are created equal. In fact, signatures (autographs) and inscriptions fall into a few different categories.
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