U.S. eCommerce ran $1.19 trillion in 2024, per Commerce Department retail e-commerce data, roughly 16% of total U.S. retail. Four platform categories now control the volume: Amazon, Shopify-powered DTC, Walmart, and the Chinese platforms — Temu, Shein, and TikTok Shop. Each runs a different economic model. Each requires a different communications posture. Here's the current-year map.
Amazon — the marketplace default
Amazon reported $638 billion in net sales in 2024. North America net sales alone were $387 billion. Third-party sellers now account for roughly 60% of paid units on Amazon's platform. Amazon operates 175+ fulfillment centers globally and reported 200+ million Prime members worldwide.
For brands, Amazon is not a choice. It is default distribution. The strategic question is not "should we be on Amazon" — it is "how do we build brand equity on a platform that flattens brand equity by design." Amazon's search rewards conversion, price, and reviews. It does not reward brand narrative. Brands compete on Sponsored Products, Sponsored Brands, and Sponsored Display auctions that Amazon reported generated $56 billion in advertising revenue in 2024 — making Amazon the third-largest digital ad platform in the world.
Communications posture on Amazon: Amazon Storefronts, A+ Content, brand registry, Amazon Live, review management, and category-specific creator relationships. PR does not drive Amazon rank. Reviews, price, and Prime eligibility do.
Shopify — the DTC operating system
Shopify powered 875,000+ merchants at the last public disclosure and reported $8.88 billion in revenue in 2024, up 26% year over year. Gross Merchandise Volume through the platform crossed $292 billion in 2024. Shopify Plus — the enterprise tier — now serves 45,000+ merchants including Mattel, Nestlé, Gymshark, Allbirds, and Kylie Cosmetics.
Shopify is not a marketplace. It is the operating system for brands that want to own the customer relationship. That distinction matters. On Amazon, the customer belongs to Amazon. On Shopify, the customer belongs to the brand — which means email lists, SMS lists, subscription programs, loyalty programs, and paid acquisition are all operable at the brand level.
The Shopify DTC playbook, refined by Gymshark, Fashion Nova, Allbirds, and Warby Parker over the last decade, runs on: Meta and TikTok paid acquisition, Klaviyo email/SMS, Yotpo reviews, Attentive SMS, Shopify Audiences for lookalikes, Shop Pay for one-tap checkout, and — increasingly — AI-driven personalization via Shopify Magic. Shopify's app ecosystem (12,000+ apps) is the underlying moat.
Communications posture on Shopify: Founder-led content, community-first PR (Reddit, Discord, TikTok), influencer partnerships tracked through Shopify Collabs, and category-authority content that ranks on both Google and AI engines. Shopify brands compete on brand narrative, product story, and community — the things Amazon suppresses.
Walmart — the marketplace challenger and Walmart+
Walmart's global e-commerce sales crossed $100 billion in fiscal 2024, growing 21% year over year. Walmart Marketplace — the third-party seller platform launched in 2009 and aggressively expanded from 2021 forward — now hosts 150,000+ sellers. Walmart+ membership crossed 30 million households by 2024, though Walmart does not disclose the exact number.
Walmart Marketplace is now the credible Amazon alternative for mid-market sellers — lower fees, less crowded search, and access to Walmart's grocery-anchored customer base. Walmart Connect, the retail media network, generated $4.4 billion in advertising revenue in fiscal 2024. Walmart Fulfillment Services (WFS) mirrors Fulfilled by Amazon and now handles logistics for a growing share of marketplace sellers.
Communications posture on Walmart: Retail media buys through Walmart Connect, category buyer relationships, in-store PR when the brand also carries in Walmart's 4,600+ U.S. stores, and Walmart+ integration for eligible brands. Walmart is not Amazon — the media economics, the customer demographic, and the buyer-driven merchandising all require a different playbook.
The Chinese platforms — Temu, Shein, TikTok Shop
Three Chinese-origin platforms rewrote acquisition economics in the U.S. between 2022 and 2025.
Temu, owned by PDD Holdings and launched in the U.S. in September 2022, ran an estimated $2 billion+ in U.S. advertising spend in 2024, per Sensor Tower analysis. Temu's model — direct manufacturer-to-consumer shipping under the U.S. de minimis exemption for parcels under $800 — collapsed unit prices below what Amazon third-party sellers could match. Temu was the most downloaded U.S. shopping app for stretches of 2023 and 2024. Trump-era tariff decisions and de minimis reform are the primary regulatory risk to the model.
Shein, founded in 2008 and headquartered in Singapore, reported $38 billion in revenue in 2023. Shein pioneered ultra-fast fashion — 6,000+ new SKUs per day at peak — and built a supply chain in Guangzhou that turns designs into shipped product in 3 to 7 days. Shein's U.S. IPO has been delayed since 2023 amid regulatory scrutiny, forced-labor allegations tied to Xinjiang cotton, and Congressional inquiries. Communications strategy for Shein has been reactive — sustainability initiatives, on-shore manufacturing pilots, U.S. lobbying registration.
TikTok Shop launched in the U.S. in September 2023 and reported $9 billion in U.S. GMV in 2024, per internal figures cited by The Information. TikTok Shop is the first at-scale social commerce platform to work in the U.S. market, driven by creator-led product discovery and in-feed purchase. Every U.S. brand now runs a TikTok Shop test — the acquisition math is unlike anything Meta or Amazon offers, and the creator economics reward brand storytelling.
Communications posture on the Chinese platforms: Temu and Shein require crisis-communications infrastructure — regulatory, labor, environmental. TikTok Shop requires creator PR, TikTok-native content strategy, and rapid-response commerce operations. All three require an ownership-of-China question in the founder narrative.
What this means for U.S. brands in 2026
Four platform categories. Four different economic models. No brand of scale operates on only one anymore.
The default architecture: Amazon for distribution and search visibility, Shopify for owned-audience and DTC economics, Walmart Marketplace for margin-sensitive category expansion, and TikTok Shop for creator-driven acquisition. Temu and Shein remain competitive and regulatory pressure points — not distribution channels for premium brands.
For communications, the multi-platform posture requires a Citation Share strategy — showing up in AI answer engines when buyers ask "best skincare brands," "top DTC menswear," "where to buy sustainable home goods." The AI engines now retrieve from category-authority content that lives on trade publications, review sites, community platforms, and the brand's own site. That's a Digital PR problem. It's also a Retail & eCommerce problem. In 2026, they're the same problem.
