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AI-generated books flood Amazon, hurting human authors' sales

A new study finds that AI-generated books make up 20% of Amazon's self-published catalog but only 12% of sales, and revenue per book is dropping for human authors in seven of eight genres. This data could provide market-harm evidence for copyright lawsuits against AI companies.

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AI Books Flood Amazon: The Truth Behind Declining Sales and Market Dilution

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A study of over 14,000 self-published e-books shows that AI-generated content is squeezing out human authors through quantity rather than quality, with even books without detected AI text seeing declining per-book revenue.

  • The study analyzed 14,419 self-published e-books and found that books with high AI content made up 20% of the catalog but contributed only 12.1% of sales and 11.3% of revenue.
  • From Q1 2023 to Q1 2026, the catalog grew 38.3-fold, but quarterly revenue only grew 8.9-fold, leading to a general decline in per-book revenue.
  • In seven of eight genres, per-book revenue for books without AI text declined; the only exception was Fantasy/Supernatural/Horror, where revenue rose 35%.
Open section navigationResearch Background and Methodology

Research Background and Methodology

Researchers analyzed 14,419 randomly selected self-published e-books from January 2023 to March 2026, and obtained an internal dataset from one of the top five U.S. publishers, tracking about 500,000 Amazon books and covering approximately 95% of daily e-book sales.

Unlike previous studies that only detected AI text in previews, this study used the Pangram v3.3 detector to classify full texts, with a reported false positive rate of 0.04%. Books were categorized into three tiers based on the percentage of AI-marked text: none, light (≤25%), and heavy (>25%).

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Credibility boundary

This study relies on internal datasets and a detector, but the detector is only an estimate, and the study is observational, not causal. Some data comes from secondary reports, such as the 'Coral Hart' case.

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  1. AI-generated books are flooding Amazon and tanking sales for human authorsTHE DECODER

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