New Delhi, Nov. 4 -- As the billionaire tax debate heated up in California, it drew some unusual participants last week. An artificial intelligence (AI) audit of the research papers of Emmanuel Saez and Gabriel Zucman-two authors most closely identified with the wealth tax proposal-revealed several errors and biases in their work.

Published on an anonymous website, the audit was shared widely by influencers opposed to the tax. Others began questioning the wisdom of relying on AI audits on a complex subject. The former chairman of the council of economic advisors to the American President, Jason Furman, ran his own audit to find that the original audit report was biased.

The episode provides a sneak preview of the future of policy debate...