Sadly, I don't have much time to write now. If books were not fungible in any way, then a publisher could charge a lot of money for a particular book, as the only way to get that book is to pay its price. No collusion would be needed, they just need to sell the book for a lot of money. I suspect that the publishing industry has found that there is competition in the book market which is caused by fungibility. Moreover, I believe that they think that their main competition are books published by other big publishers. Thus, publishers colluded to keep prices high.
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