New study says AI-written books now make up about 20% of sampled Amazon titles and crowd out human authors
TuhinChakr · x · 2026-07-28
This paper argues that AI-written books are not just low-quality noise: at scale, they can materially distort the market for human authors.
Key findings reported in the thread:
- AI-heavy books are now about 1 in 5 titles in the sample, across genres.
- They earn fewer copies on average than human-written books, but their sheer volume gives them meaningful market share.
- As AI books enter a genre, human titles lose top-chart slots; the effect is strongest in Kindle Unlimited-heavy categories.
- The authors say this is evidence for the copyright argument that AI outputs can compete with the works they were trained on, citing Kadrey v. Meta and Judge Vince Chhabria’s market-dilution framing.
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