Tyler Cowen published a new "generative book" that he says was fully written by himself.

The claim is that, by 2026-03-26, Cowen had published (released publicly) a new work he calls a 'generative book' and that he describes it as fully written by himself. True: a release by Cowen dated on or before 2026-03-26 is presented as a 'generative book', and he states it was fully written by him. Mostly true: the work was released and labelled that way, with a minor discrepancy in the wording of his authorship statement or in the release date (still on or before the claim date). Mostly false: the work was only announced, or was released after 2026-03-26, or Cowen's own description says parts were written by others, for example by AI. False: no such book was released by Cowen.

Set before the research began.

1. E1 *The Marginal Revolution: Rise and Decline, and the Pending AI Revolution* - Marginal REVOLUTION Marginal Revolution (Tyler Cowen's blog) · 26 March 2026 Own record

   “It has four chapters, is about 40,000 words, is fully written by me (not a word from the AIs), and it is attached to an AI with a dual page display, in this case Claude.”

2. E2 *The Marginal Revolution: Rise and Decline, and the Pending AI Revolution* - Marginal REVOLUTION Marginal Revolution (Tyler Cowen's blog) · 26 March 2026 Own record

   “I am offering a new piece of work — I do not quite call it a book — online and free.”

3. E3 Tyler Cowen Mercatus Center at George Mason University Own record

   “Cowen’s latest project is a generative book, *The Marginal Revolution: Rise and Decline, and the Pending AI Revolution*.”

Cowen's Marginal Revolution post of 2026-03-26 releases the work "online and free" and says it is "fully written by me (not a word from the AIs)" (E1, E2). The Mercatus Center scholar page calls it a "generative book" (E3). In the quoted text of the release post, however, Cowen says "I do not quite call it a book" (E2), so the label differs slightly in his own wording. All of the evidence comes from Cowen or the institution he is affiliated with. Still, the release post is the record of the publication itself, and the claim is about how he describes his own work.