# Impact of AI Search Summaries on Website Traffic: Evidence from Google AI Overviews and Wikipedia

arXiv: https://arxiv.org/abs/2602.18455 · HTML: https://mlsanity.com/paper/2602.18455/

## Key facts

- Cited by 4 papers in the map (data through 14 Oct 2026).
- Builds on 6 of its 59 references that are in the map.
- First posted on arXiv 5 Feb 2026.

## Builds on (most cited first, 6 of 6)

- [Are Large Language Models a Threat to Digital Public Goods? Evidence from Activity on Stack Overflow](https://mlsanity.com/paper/2307.07367/) (2023)
- [Why the World Reads Wikipedia: Beyond English Speakers](https://mlsanity.com/paper/1812.00474/) (2018)
- [Fair Document Valuation in LLM Summaries via Shapley Values](https://mlsanity.com/paper/2505.23842/) (2025)
- [What is Trending on Wikipedia? Capturing Trends and Language Biases Across Wikipedia Editions](https://mlsanity.com/paper/2002.06885/) (2020)
- [A Large-Scale Characterization of How Readers Browse Wikipedia](https://mlsanity.com/paper/2112.11848/) (2021)
- [Countering underproduction of peer produced goods](https://mlsanity.com/paper/2504.21240/) (2025)

## Built on by (most cited first, 4 of 4)

- [Measuring Google AI Overviews: Activation, Source Quality, Claim Fidelity, and Publisher Impact](https://mlsanity.com/paper/2605.14021/) (2026)
- [The Impact of AI Search on the Online Content Ecosystem: Evidence from Google and Reddit](https://mlsanity.com/paper/2605.16428/) (2026)
- [Scoring Without the Engine: Validating a Deterministic, Manipulation-Resistant Content Score for Generative Engines, End to End](https://mlsanity.com/paper/2609.07559/) (2026)
- [SlopShape: Identifying AI-Generated Commercial Web Content](https://mlsanity.com/paper/2609.15369/) (2026)

## Abstract (arXiv)

Search engines increasingly display AI-generated answers above organic links, potentially displacing traffic to upstream publishers. We estimate the impact of Google's AI Overviews (AIO) on Wikipedia's search traffic using AIO's staggered geographic rollout and Wikipedia's multilingual structure. Our difference-in-differences design compares monthly external-search referrals to English Wikipedia articles with referrals to the same articles in German and French, and finds that default AIO availability reduced English search traffic by 5.45% and 4.82%, respectively. Our results suggest that answer-producing digital intermediaries can materially reallocate attention away from informational publishers, with implications for content monetization, search platform design, and policy.