Second-hand book sales are booming — is AI buying them up to train models?
The global second-hand book market is growing steadily, with speculation that AI companies buying up large volumes of books for model training may be one of the driving forces, alongside rising new book prices and social media trends.
The publishing and tech communities are debating the significant growth of the second-hand book market, sparked by a popular Hacker News discussion (62 points, over 68 comments) questioning whether this growth is linked to AI.
The most intriguing hypothesis is that AI development companies may be buying up massive quantities of books to use as training data. These books might be scanned into systems before being destroyed or pulped. If true, a portion of the demand in the second-hand market comes not from readers, but from the AI industry's hunger for high-quality text data.
However, this remains an industry analysis without definitive proof. Meanwhile, several other major factors are driving the second-hand market: rising new book prices pushing consumers toward cheaper alternatives, e-commerce platforms and recommendation engines making rare books easier to find, social media trends like BookTok, and the circular economy movement promoting resource reuse.
Multiple global second-hand book market reports point in the same direction, showing steady growth driven primarily by e-commerce and affordability. Therefore, AI is likely just a contributing factor rather than the main cause of this boom.
This highlights how the demand for AI training data may be starting to impact global markets, including books, directly affecting readers, used bookstores, and publishers. If AI companies increasingly source data from physical books, the pricing and lifecycle of second-hand books locally could also be influenced.