Affiliate Marketing and AI in 2026

Key Findings

1. The market is in a paradoxical "growth + erosion" phase. Spend is up double digits, but the foundational traffic source (Google organic) is shrinking sharply for the content publishers that have historically delivered it.
2. AI adoption inside affiliate marketing is effectively universal. Authority Hacker, impact.com and Salesforce all measure adoption at 79%–97%. The laggard question is no longer "if" but "how mature."
3. The publishers most exposed are review/comparison/affiliate content sites in informational verticals. Per a January 2026 Futurism report citing Growtika research tracking 10 major tech publications from early 2024 through January 2026, the cohort's combined US Google traffic collapsed from a peak of 112 million monthly visits to just under 50 million. Site-level losses included Mashable −30%, Wired −62%, HowToGeek, The Verge and ZDNet each −85%+, and Digital Trends −97%.
4. Cashback, loyalty, voucher and creator-driven publishers are gaining share because their value (deal verification, authenticity, trust) is harder for an LLM to replicate cleanly.
5. Agentic commerce is the structural reset. It is unclear whether affiliates retain attribution when an AI agent transacts inside ChatGPT, Gemini or Copilot. The 4% OpenAI merchant fee on Shopify orders effectively becomes a new affiliate-like rail competing with Awin, CJ, Impact and Rakuten.

How this report was made

This report was built from public market forecasts, publisher traffic studies, legal filings, academic research, platform announcements, and vendor surveys. The goal was to compare the strongest signals against each other instead of treating one dataset as the whole story.

Created by

Nora V.

SEO Strategist · nora@revshare.so

Nora shapes the search structure, table of contents, internal links, and comparison angles for affiliate guides.

Reviewed by

Emil Klitmose

Founder, Revshare · hello@revshare.so

Emil writes about affiliate infrastructure, publisher monetization, attribution, and how AI is changing partnership marketing.

We separated market growth from traffic risk, then checked where the numbers agreed or conflicted. When sources varied, the report favors named research bodies, regulatory sources, academic work, and first-party platform announcements over broad aggregator claims.

Details

1. Market overview: affiliate marketing in 2025-2026

Global size and growth. Estimates diverge by methodology, but cluster around $17–$20 billion in 2025, with a CAGR somewhere between 8% (Cognitive Market Research, 2025) and 15.2% (Business Research Insights, 2026). Authority Hacker and Yahoo Finance project the market to reach $27.78 billion by 2027 and $38.35 billion by 2030. Grand View Research's narrower "affiliate marketing platform" market was $22.6 billion in 2025, projected to $35.7 billion by 2033 at 5.9% CAGR.

US benchmark. EMARKETER's September 2025 forecast puts US affiliate ad spend at $12.42 billion in 2025 and $13.81 billion in 2026 (+11.3% YoY), well ahead of US retail ecommerce sales growth of 6.7%. The channel will generate an estimated $241.03 billion in US ecommerce sales in 2026 (EMARKETER). The Performance Marketing Association/London Research *Industry Study 2025*, the most authoritative US data set, draws on eight networks (Ascend by Partnerize, Awin, CJ, Everflow, LinkConnector, Partnerize, Rakuten Advertising, ShareASale) and 50+ publishers. It recorded $13.63 billion in US affiliate spend in 2024 (49.8% above 2021), driving $113 billion in ecommerce sales (9.4% of total US ecommerce) at an average $11:$1 ROAS.

Regional breakdown (2024-2025).

• North America: ~40% of global revenue (Cognitive Market Research, 2025).
• Europe: ~30% of global revenue; UK spend grew 17% YoY 2022–2023 (APMA); Europe CAGR 6.5% through 2031.
• Asia-Pacific: ~23% share, fastest growth at ~10% CAGR.

Adoption breadth. Per Rakuten/Forrester (cited widely): 81% of advertisers and 84% of publishers run affiliate programs. Per APMA, more than 50% of UK brands planned to increase affiliate investment in 2025. Yet Forrester's 2024 affiliate report finds only 7% of marketing managers rank affiliate as a top budget priority, meaning the channel remains under-prioritized relative to its proven ROI.

Network landscape. Amazon Associates dominates with ~46% global network market share and an estimated 900,000+ affiliates. Awin completed its absorption of ShareASale in October 2025, creating a combined network of 9,500 advertisers and 250,000 active publishers (Awin, October 2025). It was one of the largest consolidations in the channel's history; the ShareASale platform was retired on October 6, 2025. Impact, CJ, Rakuten Advertising and ClickBank round out the top tier.

Publisher economics.

• Average ROAS: $11–$15 per $1 spent (PMA 2025; Cognitive Market Research, 2025).
• Travel ROAS: $19:$1; Retail $11:$1 (PMA 2025).
• Authority Hacker (2024–2025 survey of 2,270 affiliates): average monthly earnings $8,038; average RPM (revenue per 1,000 visitors) $149.76; 81.2% of affiliates earn under $20,000/year while just 3.78% earn over $150,000.
• Highest-paying niches: education/e-learning ($15,551/mo avg), travel ($13,847), beauty/skincare ($12,475).
• SaaS programs offer the steepest commissions (20%–70%, often recurring).

Publisher-mix shifts (PMA 2025, 2021 → 2024):

• Cashback/loyalty/rewards: flat at 35% (largest single share).
• Coupon/voucher/rebate: 16% → 10% (–37%).
• Bloggers/content creators: 34% → 42% of *content* spend.
• Major media/publishing houses: 46% → 35% of content spend.
• Social/influencer/creator: 8% → 9% (likely undercounted).
• By advertiser vertical: Retail fell from 76% to 63%; Financial Services 12% → 15%; Travel 5% → 9%; Telecom 3% → 7%.

The PMA's directional read: discount-led, loyalty-led and creator-led publishers are gaining share; thin SEO-driven affiliate content sites are losing it.

2. AI in affiliate marketing: the opportunity

Adoption is now the baseline, not the differentiator.

• 97% of brands and 96% of creators are already using AI in their partnership programs (impact.com, *State of Affiliate Marketing 2025*, n=1,500+ marketers across 8 countries).
• 79.3% of affiliate marketers use AI tools for content creation (Authority Hacker, 2024 survey of 2,270 affiliates), more than double any other emerging trend.
• 87% of marketers use generative AI in at least one recurring workflow in Q1 2026, up from 51% in 2024 (Salesforce *State of Marketing 2026*, n=4,450 marketing decision-makers across NA, LatAm, APAC, Europe).
• 89.5% of marketers have integrated AI into their processes, though only 24.3% have experimented with agentic AI (Outcomes Rocket, June 2025, n=1,229).

Where AI delivers the most measurable productivity uplift.

• Average marketer recovers 6.1 hours/week from AI workflows (HubSpot AI Trends 2026); senior marketers save 8–10 hours.
• Top ROI use cases per McKinsey Global AI Survey: content drafting 3.2x ROI, personalization engines 2.7x, audience research 2.4x, ad copy 2.3x.
• Marketers using AI are 25.6% more likely to report content success than non-users (CoSchedule *State of AI in Marketing 2025*, n=1,005).
• 75% of marketers are turning to AI to close personalization gaps (Salesforce, 2026).

Use-case taxonomy specific to affiliate marketing.

1. AI content generation: product reviews, comparisons, gift guides, listicles. ~80% of affiliates use AI for this; the top adoption trend.
2. SEO/GEO optimization: schema markup, FAQ pages, structured comparison content optimized to be cited inside AI Overviews and answer engines.
3. Personalization & recommendations: dynamic product feeds based on visitor intent.
4. Predictive analytics & attribution: multi-touch attribution to replace last-click, which 94% of brands are experimenting with or planning to adopt within the next year (impact.com, 2025).
5. Automated campaign optimization: AI-powered partner matching (Awin's AI publisher recommendations; Impact's creator discovery); commission structuring.
6. Fraud detection: networks using machine learning to flag cookie stuffing, click injection, and bot traffic.
7. Chatbots & conversational commerce: ~16% of affiliate marketers had already integrated chatbots in 2024 (Authority Hacker).

Revenue uplift.

• Brands combining influencer + affiliate programs report a 46% increase in affiliate-based sales (Impact, 2024).
• Creator-driven affiliate revenue reached ~$1.1 billion in 2024 (up 93% from $530M in 2021); projected at $1.3 billion in 2025.
• AI-powered partner discovery is reducing affiliate-manager workload while expanding partner pools; Awin's 2025 platform release notes cite 34 new features in 2024, including AI partner recommendations and AI-generated profile descriptions.

Marketer sentiment.

• IAB (2025): over half of marketers already use GenAI for creative content and audience targeting; nearly all plan to expand AI use.
• 79% of marketers expect *generative AI* to have the most significant impact on their work; 48% cite *agentic AI* as a major near-term force (Outcomes Rocket, June 2025).
• But only one-third of brands, agencies and publishers have adopted formal AI governance tools, and >70% have encountered an AI-related incident (hallucinations, bias, off-brand content) (IAB, July 2024 survey of 125 US ad industry executives).

3. AI as a threat to affiliate marketing

This is where the report must be most candid: the same AI wave that is supercharging affiliate productivity is simultaneously eroding the audience-acquisition layer that historically fed it.

The zero-click search reset.

• Zero-click rate on Google news searches climbed from 56% in May 2024 to 69% in May 2025 (Similarweb, July 2025).
• ~60% of all Google searches end without a click; mobile is 77.2% zero-click vs. desktop 46.5% (SparkToro, 2024).
• 80% of consumers now rely on zero-click results in at least 40% of their searches (Bain & Company, 2025).

Google AI Overviews: the click cliff.

• AI Overviews now appear on 48% of all tracked search queries (BrightEdge 12-month analysis Feb 2025–Feb 2026; Ahrefs March 2026), up from 6.49% in January 2025 (Semrush) and 13.14% in March 2025.
• For *informational/how-to* queries, AI Overviews trigger on 70%+ of SERPs.
• Pew Research Center (July 22, 2025) ran the most rigorous controlled study: analysis of 68,879 Google searches from 900 US adults shows users click a traditional link 8% of the time when an AI Overview is present vs. 15% without, a 46.7% relative decline. Only 1% of users click a link cited inside the AI Overview itself.
• Seer Interactive (September 2025, 3,119 informational queries across 42 organizations): organic CTR fell 61% (from 1.76% to 0.61%) and paid CTR fell 68% for queries with AI Overviews.
• Authoritas (2025): when AI Overviews appear, top organic link CTR drops ~79%.

Real publisher and affiliate revenue losses.

• Penske Media Corporation (PMC), owner of Rolling Stone, Billboard, Variety, The Hollywood Reporter, filed a federal antitrust lawsuit against Google in DC federal court on September 12, 2025. The complaint states that AI Overviews appear on ~20% of Google searches linking to PMC sites, and that PMC's affiliate revenue fell by more than a third from its peak by end-2024. PMC noted "approximately half of all traffic to PMC websites came from Google."
• Press Gazette (2025): publishers report AI Overviews driving "a corresponding drop in affiliate revenue from 20–40% in some cases."
• Chegg (February 2025 antitrust suit): non-subscriber traffic fell 49% between January 2024 and January 2025.
• Digital Content Next (40 premium publishers including NYT, Condé Nast, Vox), May–June 2025 data from 19 members: median YoY referral traffic from Google down 10% overall, –7% for news brands, –14% for non-news brands.
• Business Insider: –55% organic search traffic April 2022 to April 2025 (Similarweb).
• DMG Media (MailOnline/Metro): desktop CTR down 56.1%, mobile down 48.2%; up to 89% click loss for searches with AI Overviews.
• News-sector aggregate: monthly visits to news sites fell from a peak of 2.3 billion in mid-2024 to ~1.7 billion by May 2025, a loss of >600 million visits/month (Similarweb).

Google's December 2025 Core Update: the biggest single ranking hit to affiliate sites in history.

• Affiliate sites: 71% experienced significant traffic drops (industry analysis across 150+ affected sites).
• Health/YMYL: 67% affected; e-commerce: 52%.
• "Thin affiliate content lacking original testing or analysis" was the single most targeted category.
• Recovery timeline: 2–6 months for most sites; 6–12 months for YMYL.

AI-driven ad/click fraud (2024–2026).

• Per CHEQ's May 31, 2022 PR Newswire press release (analysis of 50,000+ websites with 2,000 cybersecurity tests per visit), "17% of all traffic coming from affiliate programs is fake" and "the industry is expected to lose over $3.4 Billion to fraud in 2022."
• Bots contribute ~24% of all affiliate marketing traffic (Tapper, 2026).
• Mobile affiliate fraud rates run ~50% higher than desktop due to tracking vulnerabilities.
• Cookie stuffing affects 5%–10% of affiliate transactions; ~25% of affiliate-generated leads may be fake or low quality.
• Bad bots accounted for 37% of all internet traffic in 2024 (Imperva 2025 Bad Bot Report), up from 32% in 2023.
• Global ad fraud cost is forecast to grow from $114 billion in 2025 to $172 billion in 2028 (Statista; cited by multiple sources).
• General Invalid Traffic from AI crawlers surged 86% in H2 2024 (DoubleVerify).

Content commoditization & algorithm penalty risk.

• Google's Helpful Content Update and subsequent core updates have hit "competent but generic" AI-assisted content hardest. Travel publishers tracked in industry analyses (671 sites): 32% lost more than 90% of organic traffic after the September 2023 HCU.
• Affiliate marketers report 25.1% were negatively affected by search algorithm updates; 47.4% of affected marketers changed content strategy.
• "Site reputation abuse" policy (March 2024) reduced major-publisher share of affiliate content spend from 46% to 35% (PMA 2025).

ChatGPT and other answer engines compounding the pressure.

• Shopping-related queries on ChatGPT grew faster than any other query type Dec 2024–June 2025 (Sensor Tower data via EMARKETER, October 2025).
• 54% of generative-AI users use it for price comparison, 41% for deal finding, 41% for review checking (Wildfire Systems, July 2025).
• ChatGPT now handles over 2.5 billion prompts per day (Sam Altman to Axios, July 2025; via TechSpot), up from ~1 billion in December 2024.
• OpenAI announced 700 million weekly active users the week of August 4, 2025 (CNBC, citing OpenAI), up from 500 million in March. That was a more than fourfold YoY surge; by December 2025 OpenAI reported 800M+ weekly users.
• ChatGPT referrals to publishers grew 25x year-over-year (Similarweb, July 2025).
• But, critically, Kaiser & Schulze, "ChatGPT Referrals to E-Commerce Websites: How Do LLMs Compare Against Traditional Channels?" (SSRN ID 5585812, October 8, 2025; subsequently in *Marketing Science* Articles in Advance, DOI 10.1287/mksc.2025.0489, April 21, 2026), analyzed 12 months of first-party data from 973 e-commerce websites with $20 billion combined revenue, comparing over 50,000 ChatGPT-referred transactions to 164 million transactions from traditional channels. The headline finding: affiliate links were 86% more likely to convert than ChatGPT referrals, and organic search outperformed ChatGPT by ~13%. ChatGPT traffic was <0.2% of total traffic. The authors note results "contradict widespread expectations of oLLM superiority" but caution the gap is "projected to narrow" over the next 12 months. *This is the strongest academic baseline currently available.*

4. The forward-looking layer: agentic commerce, regulation and survival paths

Agentic commerce arrives.

• OpenAI launched Instant Checkout on September 29, 2025, powered by the open-sourced Agentic Commerce Protocol (ACP) built with Stripe. Etsy went live at launch; over a million Shopify merchants (Glossier, SKIMS, Spanx, Vuori) followed. Per Shopify's own merchant documentation, the implemented fee on Shopify ChatGPT orders is 4% of item price plus shipping and tax (with a 30-day free trial after first qualifying order, US-only, Shopify Payments required). Sam Altman's earlier March 2025 framing in a Stratechery interview referenced a "2% affiliate fee or something", but the actually implemented rate is 4%. OpenAI's own blog says only "a small fee."
• Google + Shopify launched the Universal Commerce Protocol (UCP) on January 11, 2026 at the National Retail Federation's Big Show in New York. Sundar Pichai's remarks: *"As a next step we are introducing the Universal Commerce Protocol (UCP), designed for the era of agentic commerce. It was built to meet the needs of retailers AND customers… It's open, agnostic, built together with industry leaders Shopify, Etsy, Wayfair, Target and Walmart, and endorsed by 20+ more."* Endorsers include Visa, Mastercard, American Express, Stripe, Adyen, PayPal, Home Depot, Best Buy, Macy's, Lowe's, Michaels, Poshmark and Reebok. UCP is Apache 2.0–licensed and interoperable with the Agent Payments Protocol (AP2), Agent2Agent (A2A) and Model Context Protocol (MCP). It plugs into Google AI Mode in Search and the Gemini app.
• PayPal integrated agentic checkout into both ChatGPT and Perplexity in November 2025.
• Walmart's "Sparky" assistant now runs both inside ChatGPT and in Walmart's own app, an early test case of a retailer wrapping its own AI assistant around the new protocols. Walmart's own experiment found that conversion rates for products sold *directly* in ChatGPT were three times lower than products that rerouted users back to Walmart's site, prompting OpenAI to wind down Instant Checkout in favor of a discovery-focused ACP in early 2026.

Gartner and Forrester forecasts for the agentic era.

• Gartner (October 21, 2025): "By 2028, 90% of B2B buying will be AI agent intermediated, pushing over $15 trillion of B2B spend through AI agent exchanges."
• Gartner: By 2030, 20% of monetary transactions will be programmable to grant AI agents economic agency.
• Gartner (April 7, 2026): Agentic-AI-enabled SCM software will grow from <$2 billion in 2025 to $53 billion by 2030.
• Forrester (Predictions 2026): Five major US or European brands will unify "agentic commerce" experiences in 2026; one-third of retail marketplace projects will be deserted as answer engines steal traffic.
• Morgan Stanley: 10–20% of US e-commerce will be agent-driven by 2030.
• eMarketer: Agentic commerce market $144 billion by 2029 (narrowest definition).

The early Adobe data shows demand is exploding.

• Adobe Analytics, "Adobe: Holiday Shopping Season Drove a Record $257.8 Billion Online with Consumers Embracing Generative AI Tools" (Adobe newsroom, January 7, 2026): Holiday 2025 traffic from generative AI tools to US retail sites was up 693.4% YoY. On Cyber Monday, +670%; on Black Friday, +805%; November 2025 +769% YoY, December 2025 +673%.
• Engagement quality is rising: shoppers from gen-AI sources were 33% less likely to bounce, spent 45% more time on-site, and viewed 13% more pages than other channels.
• In the same Adobe report, affiliates and partners' share of holiday revenue rose to 20.4%, up 15.9% YoY, meaning the affiliate channel itself is still gaining share even as AI-referred traffic grows. Adobe's lead analyst Vivek Pandya: *"This 2025 holiday season, consumers embraced generative AI more than ever as a shopping assistant in their purchasing decisions."*

Disclosure & regulatory layer (FTC, EU, AI Act).

• FTC Endorsement Guides updated June 2023 raised the "clear and conspicuous" standard. Maximum civil penalty per violation now $53,088 (2025 inflation-adjusted figure).
• FTC final rule banning fake reviews and testimonials (August 2024) explicitly covers AI-generated reviews; civil penalties up to $51,744/incident.
• The FTC has emphasized that AI/virtual endorsers are subject to the same disclosure rules as human endorsers (Arnold & Porter, December 2025).
• In 2024, US companies returned $337.3 million to consumers through FTC enforcement actions.
• EU Digital Services Act already requires platforms to offer disclosure functionality (Article 26) and very large platforms to maintain advertising repositories (Article 39).
• EU Digital Fairness Act: public consultation launched July 17, 2025; legislative proposal expected mid-2026. Will codify influencer-marketing rules, dark-pattern bans, AI/deceptive personalization rules.
• EU AI Act (effective August 2026) requires AI systems making consumer-facing recommendations to disclose when commercial relationships influence outputs.
• France's Influencer Law (June 2023) is the de facto template. It requires "publicité" labeling, "images retouchées" or "images virtuelles" disclosures, and bans on certain products. Sweden's Konsumentverket published *Rapport 2026:3 Marknadsföring via influencers* in March 2026 documenting persistent industry non-compliance.

The new attribution problem. When an AI agent transacts inside ChatGPT or Gemini, the affiliate publisher who actually drove product discovery may receive no last-click credit. 27.3% of marketers using marketing mix modeling fold affiliate into a generic performance bucket; 14.8% don't represent it at all (EMARKETER/Rakuten Rewards survey). Expect industry pressure for new multi-touch attribution standards and possibly affiliate-style revenue shares with AI assistants. Notably, per OriginalityAI data cited in an October 2025 EMARKETER report, more than one-quarter of OpenAI's content partnerships since 2021 have been with publishers operating scaled affiliate-commerce content, meaning the LLMs themselves are partly powered by affiliate content.

Recommendations

Stage 1: Defend the base (0–6 months)

1. Audit your top 50 traffic-driving affiliate pages against AI Overview presence. Use Search Console, Semrush, or Ahrefs to flag the ones where impressions are flat but clicks are falling. That is the AI Overview signature.
2. Diversify traffic immediately. Build email lists, newsletter audiences, and direct-relationship channels. These are immune to Google Zero. The Guardian's Chief Supporter Revenue Officer Liz Wynn has noted publicly that the publication often sees strong revenue performance on low-traffic days, because each visitor is worth more.
3. Trigger threshold: if any single affiliate page loses >25% organic traffic month-over-month and Search Console shows an impressions/clicks decoupling, treat it as an AI-driven decline, not a ranking penalty. The recovery playbook is different.
4. Tighten FTC compliance now. Every affiliate post must carry a clear, prominent disclosure. The $53,088-per-violation civil penalty is not theoretical. The FTC has taken action against Fashion Nova, Google/iHeartMedia ($9.4M), and Sitejabber. Embed disclosure into the first 100 characters of any caption or article.

Stage 2: Adapt the content model (6–18 months)

1. Pivot from "thin best-of listicles" to defensible expertise. Google's December 2025 Core Update hit affiliate sites at a 71% rate; the survivors had original testing, named authors with credentials, methodology pages, and unique data.
2. Optimize for citation, not just ranking. Per AirOps' *The 2026 State of AI Search* report, 59.6% of AI Overview citations come from URLs not ranking in the top 20 organic results. The new SEO is GEO (Generative Engine Optimization): structured data, FAQ schema, answer-first paragraphs, clear question-driven H2s, schema.org Product markup.
3. Use AI selectively, not generatively at scale. AI-drafted, human-edited content with original insight survives core updates; AI-at-scale content gets demoted. Google's John Mueller has publicly stated the system doesn't penalize AI; it penalizes lack of helpfulness.
4. Reallocate share toward cashback, loyalty, creator partnerships. PMA 2025 data shows these are the publisher categories gaining share. Voucher-code partners are still among the most resilient, because the user must click the code link to redeem.
5. Threshold: if your site's affiliate revenue per 1,000 visitors (RPM) falls below $50 (well under Authority Hacker's $149.76 industry average), it's time to either re-niche, paywall, or shift the business model.

Stage 3: Position for agentic commerce (12–36 months)

1. Apply now to OpenAI's Agentic Commerce Protocol and Google/Shopify Universal Commerce Protocol. Brands not listed in these structured catalogs will be invisible in agent-driven shopping. Costs are real (4% Shopify-ChatGPT fee + engineering effort), but invisibility is fatal.
2. For affiliates and content publishers: invest in becoming a trusted source LLMs cite. With >25% of OpenAI's content partnerships involving affiliate-commerce publishers (OriginalityAI/EMARKETER, October 2025), your editorial reputation is now a commercial asset.
3. For networks (Awin/Impact/Rakuten/CJ): build pass-through tracking for AI-mediated transactions. Voucher-code standardization (e.g., the APMA-proposed "MS1225-100" naming convention, *brand + date + value*) is one defense. Multi-touch attribution that recognizes pre-click AI influence is the bigger play.
4. Threshold for a strategic pivot: when >20% of your converting visitors arrive from AI referrers (ChatGPT, Perplexity, Gemini, Copilot), treat AI as a primary channel. Build dedicated landing experiences and structured data for it. Today, even at Adobe's holiday 2025 figures, AI is still <1% of total e-commerce traffic; but the doubling rate is fast enough that mid-2027 is a realistic crossover point for early-adopter categories.

Stage 4: Regulatory readiness

1. Map every affiliate program against EU AI Act disclosure obligations (effective August 2026) and the upcoming EU Digital Fairness Act (proposal expected mid-2026).
2. Implement machine-readable disclosure metadata (schema.org) on sponsored creator content so AI agents surfacing recommendations can carry disclosure forward.
3. Maintain a public transparency page listing active creator partnerships as a defensible fallback when AI agents surface affiliate-influenced content without disclosure.

Sources and references

The report uses public research, publisher filings, vendor surveys, market forecasts, academic research, and regulatory materials. External source links on this page are rendered with nofollow attributes.

• Performance Marketing Association and London Research: US affiliate industry spend, sales, publisher mix, and ROAS benchmarks.
• EMARKETER and Rakuten Advertising: US affiliate spend forecasts, attribution research, creator-commerce analysis, and agentic commerce coverage.
• impact.com, Authority Hacker, Salesforce, HubSpot, CoSchedule, IAB, McKinsey, and Outcomes Rocket: AI adoption, productivity, governance, and affiliate-marketer survey data.
• Pew Research Center, Similarweb, SparkToro, Bain & Company, BrightEdge, Ahrefs, Semrush, Seer Interactive, Authoritas, and Digital Content Next: AI Overview, zero-click, search traffic, and publisher referral data.
• Penske Media Corporation, Press Gazette, Chegg, Business Insider, DMG Media, and Futurism: publisher traffic, affiliate revenue, and litigation examples.
• Kaiser & Schulze on SSRN and Marketing Science: academic baseline comparing ChatGPT-referred transactions with traditional ecommerce channels.
• OpenAI, Stripe, Shopify, Google Blog, PayPal, and Walmart: agentic commerce, instant checkout, and AI shopping infrastructure.
• Adobe Analytics, Gartner, Forrester, Morgan Stanley, and Sensor Tower: AI shopping traffic, agentic commerce forecasts, and consumer usage trends.
• Federal Trade Commission, European Commission, EU Digital Services Act, EU AI Act, Konsumentverket, and Arnold & Porter: disclosure, influencer marketing, AI recommendation, and consumer-protection rules.
• CHEQ, Imperva, DoubleVerify, Statista, and Tapper: invalid traffic, bot traffic, affiliate fraud, and ad-fraud estimates.
• Awin, ShareASale, CJ, Partnerize, Everflow, LinkConnector, Ascend by Partnerize, ClickBank, and Amazon Associates: affiliate network landscape and platform consolidation context.

Caveats

• Market-size figures vary widely (~$17B to $37B for 2025 globally) because sources include different scopes. Some count only network spend, others include influencer commissions, software platforms, and creator-attributable revenue. The PMA's $13.63B *US* 2024 figure is the most rigorously sourced number in the report; the EMARKETER $12.42B US 2025 figure is its closest peer.
• Google's official position is that "total organic click volume from search to websites has been relatively stable year-over-year" (Liz Reid, VP and Head of Search, blog post, August 2025). Independent data from Pew, Similarweb, Ahrefs, Seer, Authoritas and DCN all contradict this, but Google has not been transparent about its underlying numbers.
• **Kaiser & Schulze (SSRN ID 5585812, October 2025; *Marketing Science*, DOI 10.1287/mksc.2025.0489, April 2026) is the strongest academic baseline** for the AI-vs-affiliate question and currently shows affiliate links convert 86% better than ChatGPT referrals, but the authors themselves note the gap is "projected to narrow." This is a moving target.
• Adobe Analytics' 693.4% YoY AI traffic figure is from a low base; absolute AI-referred traffic is still under 1% of total US retail traffic. The growth rate is real; the share is still small.
• Agentic commerce monetization economics are unsettled. OpenAI's blog says "small fee"; Sam Altman's pre-launch March 2025 Stratechery interview referenced 2%; Shopify documentation shows 4%; OpenAI also reportedly wound down direct-checkout in favor of discovery-routing in early 2026 after Walmart's 3x lower conversion rates. This is likely to evolve quickly.
• Many statistics in this report come from vendor-funded or aggregator sources (Authority Hacker, Cognitive Market Research, Business Research Insights, Influencer Marketing Hub, Post Affiliate Pro). Where possible, the report prioritizes Pew Research, the PMA, EMARKETER, Salesforce, IAB, Adobe, peer-reviewed academic work (Kaiser & Schulze in *Marketing Science*), and named consultancies (Gartner, Forrester, McKinsey).
• AI Overview presence rates differ sharply by vendor and methodology. Semrush, Ahrefs, BrightEdge and Google itself all report different numbers. The 48% March 2026 figure (Ahrefs/BrightEdge) is the highest credible reading; Semrush has shown peaks of 24.6% and dips back to 15.7% in the same year. Treat any single point estimate with caution.