not the 1st stupid question..

[darren]

what does it mean if the book has a black marker line on the bottom of the pages?

 

[hoochmonkey9]

it's a remainder copy.
these books are marked by the publisher/ bookseller when the book is no longer selling well. they are then sold at reduced prices. the mark is so they cannot be returned to the pubisher as a "new" book.
a remainder mark usually reduces the books value on the secondary market.