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The real reason is that Mass Market Paperbacks (the smaller size) are ``strippable'', and when published, have to be potentially profitable enough that a publisher can absorb the cost of bookstores ``returning'' the books unsold for credit by ``stripping'' the books' front covers and returning those and pulping the balance of the book.
This is a business model which needs to go away --- there are a few publishers which won't accept stripped books, wish they'd all make that change.
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