Internet/e-commerce is the largest sector by dollar figure of anything you've asked about — but also the one where headline numbers vary the most, since it's essentially "all of retail going digital" rather than a discrete industry.BackgroundE-commerce covers online retail transactions (B2B and B2C), digital marketplaces, and the platforms that power them. Because it overlaps so heavily with global retail as a whole, market-size estimates vary enormously depending on what's counted — global ecommerce figures often look contradictory because different sources measure different things: one forecast may count retail ecommerce sales, another consumer physical goods, a third may include B2B transactions, marketplace GMV, or wider online business activity.The most commonly cited retail-sales figure: Shopify, using EMARKETER forecasts, estimates global retail ecommerce sales at around $6.88 trillion in 2026, up from roughly $6.42 trillion in 2025, with ecommerce accounting for about 21.1% of worldwide retail sales in 2026. Mobile commerce now represents 60% of total e-commerce sales, and social commerce specifically is a $2.11 trillion market in 2026, growing at 29% CAGR — a sign of how much of the growth is coming from new channels (TikTok Shop-style platforms) rather than traditional online stores.Why people invest — the core reasons
- Structural, ongoing share shift from offline to online. More than 75% of internet users shopped online in 2024, and by 2028, 50% of the global population aged 14 and older is expected to be online shoppers — this shift is still underway, not complete, particularly in emerging markets.
- Fastest growth is now in underpenetrated regions. The highest growth in e-commerce sales is projected in Southeast Asia and Latin America, rising from 14.4% to 23% of sources in 2025, and the Middle East, while currently only 7.5% of global market share, is projected to show the fastest growth rate as digital infrastructure expands.
- US market still has real runway despite maturity. Forrester Research projects US retail e-commerce will reach $1.8 trillion by 2030, representing 29% of total retail sales — up from 22% in 2025, showing even the most mature market has meaningful share left to capture.
- AI is transforming the operational and merchant side, not just the shopping experience. AI-driven automation is transforming online store creation and merchant onboarding, lowering the barrier for new sellers and potentially improving margins for platform providers.
- B2B e-commerce is a large, less-discussed growth pocket. Much investor attention goes to consumer platforms, but B2B digital commerce (wholesale, procurement) is a substantial and growing segment in most market definitions, often overlooked relative to the consumer-facing names.
- The platform/infrastructure layer offers a picks-and-shovels alternative. The global e-commerce platform market — the technological backbone enabling businesses to build and scale online sales — was valued at $11.55 billion in 2025, projected to grow to $61.83 billion by 2034 at a 20.49% CAGR, giving investors exposure to the infrastructure (Shopify-style platforms) rather than betting on individual retail brands.
- Logistics and fulfillment are inseparable growth beneficiaries. As e-commerce scales, so does demand for warehousing, last-mile delivery, and logistics technology — a natural adjacent theme to any e-commerce allocation.
- Concentrated, well-known large-cap access points. Unlike some newer themes covered in this conversation, e-commerce offers decades of track record via a small number of dominant global platforms (Amazon, Alibaba, MercadoLibre, Shopify, Walmart's e-commerce arm), alongside faster-growing regional and vertical players.
The gainsUS e-commerce revenue is projected to reach $1.22 trillion in 2026, with an expected CAGR of 6.07% through 2030, and at a country level, China, the United States, and Western Europe lead global e-commerce, with combined sales exceeding $5.17 trillion in 2025. The regional growth story is telling: Asia Pacific holds 41.3% of global e-commerce market share in 2026, driven primarily by China's massive digital economy, with North America following at approximately 23.5% and Europe at roughly 20.1%. Longer-range projections remain robust regardless of which scope is used — Grand View Research projects the market growing from $39.7 trillion in 2026 to $155.98 trillion by 2033 at a 21.6% CAGR under its broader definition, while narrower retail-sales-only measures still show durable high-single-digit growth through the decade.Risks
- Definitional inconsistency makes this the hardest sector to benchmark cleanly. With headline 2026 figures ranging from roughly $5 trillion to $40 trillion depending on scope, any comparative analysis needs to fix a single source and definition — mixing figures from different providers will produce meaningless comparisons. This is worth flagging clearly if this goes into a workbook.
- Thin margins and intense price competition. Retail e-commerce, especially in commoditized categories, typically carries much thinner margins than software or pharma — growth in gross sales doesn't automatically translate to comparable profit growth.
- Platform concentration risk. A small number of dominant marketplaces (Amazon, Alibaba) capture an outsized share of transaction volume, meaning smaller or newer entrants face very high customer-acquisition costs to compete.
- High cart abandonment and conversion friction. The global average cart abandonment rate stands at 70.22%, illustrating that even in a mature, well-understood channel, converting demand into actual sales remains a persistent operational challenge that eats into growth assumptions.
- Logistics, tariff, and cross-border risk. Global e-commerce depends heavily on cross-border shipping and fulfillment; tariff changes, customs rules, or shipping cost shocks (fuel, capacity) can materially affect margins, particularly for cross-border-heavy platforms.
- Currency and regional macro exposure. Given how much of the growth is concentrated in emerging markets (Southeast Asia, Latin America, Middle East), e-commerce investments in those regions carry meaningful currency and macroeconomic volatility on top of normal business risk.
- Consumer discretionary sensitivity. Unlike pharma/medtech or cybersecurity, e-commerce spending (outside staples like groceries) is more sensitive to consumer confidence and disposable income, making it more cyclical than some of the other sectors covered in this conversation.
- Regulatory scrutiny of dominant platforms. Antitrust and marketplace-fairness regulation targeting large platforms (in the EU, US, and China) is an ongoing risk for the biggest names in the space.
Not financial advice — just the landscape as it stands. Given the definitional mess in this sector specifically, if this goes into a workbook I'd suggest picking one consistent source (e.g., EMARKETER/Shopify's retail-sales figure) as the baseline and noting the scope clearly, rather than blending numbers across providers the way might work for more narrowly-defined sectors like cybersecurity or semiconductors.