Volume IV The Commerce Series MMXXVI
Revised & Expanded · Edition Two

A Field Guide
to the Online Marketplaces

Being a careful study of Amazon and three of its principal contemporaries, with observations on their habits, habitats, and distinguishing features

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Compiled from public filings & field observation
2026
Plate I · Order Commerciidae

Amazon

Marketplacius universalis
Apex Generalist
📦
Fig. 1 — Specimen at rest. Note the distinctive cardboard plumage and signature smile.

First described in a Bellevue garage in the year 1994, the specimen now known as Amazon is the largest of its kind in the Western hemisphere and arguably the world. Originally a small bookseller, it has, over three decades, broadened its diet to include nearly every category of consumer good — and a number of services besides.

Mature individuals are recognised by their dominance of the household-shopping range and their unusual two-day fruiting cycle (known to specialists as Prime). Sub-species observed include Marketplace, Kindle, Fresh, Pharmacy, and the cloud-dwelling AWS.

North America Europe Japan India Brazil Australia
Distinguishing characteristics
  • Vast catalogue across most categories
  • Rapid fulfilment via owned logistics
  • Prime subscription bundles delivery, video, music
  • Mature seller tools & APIs
  • Strong own-brand presence (Basics, etc.)
  • Alexa & smart-home integrations

¹Approximate figures drawn from Amazon’s 2024 annual filings and public estimates; subsequent quarters may revise these values. Specimens vary considerably between regions.

Plate II · Order Commerciidae

Walmart Marketplace

Hypermarchaeus americanus
Brick-and-Click

A close cousin of the brick-and-mortar superstore, this specimen exhibits a fascinating hybrid life-cycle. It nests in physical big-box habitats across the United States while extending pseudopodia into the online marketplace ecosystem. The species was first observed online in earnest after 2016, following its acquisition of Jet.com — a venture which sadly did not survive in the wild.

Notably, Walmart’s online presence is the second-largest in U.S. e-commerce by gross merchandise value. Its competitive advantage lies in grocery and same-day pickup, where it draws upon a fleet of some 4,600 domestic stores serving as makeshift fulfilment hides.

$681 B
Total Rev.
~255 M
Weekly Cust.
10.5K
Stores
~20 M
Walmart+ Est.

The Walmart+ subscription, while smaller than Amazon Prime, has shown steady growth and offers free grocery delivery — a feature its larger cousin only partially replicates. Marketplace sellers benefit from lower fees than Amazon in many categories, though the platform is more selective about which species it admits.

U.S. (primary) Canada Mexico Central America Chile
Distinguishing characteristics
  • Strong grocery & everyday-essentials offering
  • Store-as-warehouse fulfilment model
  • Generally competitive on price for staples
  • Walmart+ subscription bundle
  • Curated marketplace seller approval
  • Same-day pickup widely available

²Walmart’s fiscal year ends in January. Figures cited reflect FY2025 (concluded Jan. 2025) and are subject to revision.

Plate III · Order Commerciidae

eBay

Auctionarius pioneerensis
Senior Specimen

Among the eldest specimens in this guide, eBay was first catalogued in 1995 and is notable for its distinctive auction-bidding behaviour — a courtship ritual now rarely observed in younger marketplace species, which favour fixed pricing. The specimen has, in recent years, partially adapted by adding “Buy It Now” functionality, though its auction heritage remains a strong identifying trait.

Unusually fond of collectibles, rare goods, refurbished electronics, automotive parts, and one-of-a-kind items — territories where the apex generalists are less competitive.

The specimen has lost ground over the past two decades — once the world’s largest e-commerce platform, it now occupies a more specialised ecological niche. Its 130-or-so million active buyers represent a fraction of Amazon’s reach, but the platform retains particular strength in second-hand and collector goods markets, where its long memory of completed sales data remains a significant asset for pricing.

eBay no longer owns PayPal (separated in 2015) and uses its own managed payments system. The two organisms now coexist independently.

Its authentication services for watches, sneakers, handbags, trading cards, and similar high-value categories have been a notable evolutionary adaptation.

~133 M
Active Buyers
~1.9 B
Live Listings
$10.3 B
Rev. (2024)
190+
Markets
Distinguishing characteristics
  • Auction and fixed-price hybrid format
  • Strong second-hand & refurbished offering
  • Authentication for select luxury categories
  • Cross-border trade tools
  • Collector-friendly historical data
  • No proprietary fulfilment network

³Once dominant; now niche-adapted. A study in successful specialisation rather than failed generalism.

Plate IV · Order Commerciidae

Etsy

Artisanus handmadensis
Specialist Niche
🧵
Fig. 2 — Specimen mid-bloom. The Etsy thrives in seasonal markets, particularly autumn through winter.

Among the more delicate specimens documented in this volume, Etsy occupies an ecological niche its larger cousins have proved unable, or unwilling, to fill: that of handmade, vintage, and craft-supply goods. Its sellers number some seven million, the great majority of whom are small independent makers, hobbyists, or part-time artisans.

It is, in its way, the marketplace equivalent of a Saturday craft fair — uneven, charming, and irreplaceable in its category.
— Field Notebook, March 2026

The specimen has experienced turbulence in recent years. Active buyer numbers have softened from their pandemic peak, and a series of seller-fee adjustments triggered organised dissent — a strike of sorts — in 2022. Management has since attempted to court more buyers via discount events, with mixed results.

For sellers of one-of-a-kind, customised, and small-batch goods, Etsy remains the dominant venue in the West. Its Star Seller programme rewards consistent performers, and the platform’s search increasingly favours those who advertise.

~92 M
Active Buyers
~7 M
Active Sellers
$2.8 B
Rev. (2024)
$12.6 B
GMS (2024)
Distinguishing characteristics
  • Handmade, vintage, and craft-supply focus
  • Strong personalisation & custom-order tools
  • Sellers are predominantly small makers
  • Reverb (music gear) is a sub-species
  • No first-party logistics network
  • Star Seller & offsite-ads programmes

⁴Etsy also operates Reverb, a marketplace for musical instruments. Depop, previously part of Etsy’s holdings, may have been divested by the time you read this; check current filings.

Appendix A

Comparative Analysis

A rough, eyeballed estimation of relative strength across six dimensions. Bar lengths are illustrative, not precise.

— Catalogue Breadth
AmazonVast
WalmartBroad
eBayWide+used
EtsyNarrow
— Delivery Speed
Amazon1–2 days
WalmartSame-day
eBayVaries
Etsy1–3 weeks
— Price Competitiveness (staples)
AmazonStrong
WalmartStrongest
eBayVariable
EtsyPremium
— Uniqueness of Goods
AmazonLow
WalmartLow
eBayHigh
EtsyHighest
— Seller-Friendliness (small)
AmazonComplex
WalmartCurated
eBayOpen
EtsyMost open
— Geographic Reach
AmazonGlobal
WalmartAmericas
eBayWide
EtsyWestern-led
Amazon
Walmart
eBay
Etsy
— Field Recommendations —

When you might consider each specimen

If you need · speed

Amazon is typically the fastest for delivery of mainstream goods. Walmart is competitive — sometimes faster — for grocery and household basics in the U.S.

If you need · price

Walmart is often the lowest for everyday essentials and groceries. For tech and electronics, comparing both Amazon and Walmart usually pays off.

If you need · rare

eBay remains the best general venue for second-hand, vintage electronics, collectibles, automotive parts, and discontinued items.

If you need · unique

Etsy is unmatched for handmade goods, custom orders, and supporting small independent makers — at the cost of longer lead times.

If you sell · anything

All four accept third-party sellers, but the path is easiest on eBay and Etsy, while Amazon and Walmart involve more application and approval steps.

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Colophon & Sources

This guide was compiled from the most recent annual filings, public investor communications, and press releases issued by each named organisation, as available in early 2026. Figures are approximate and rounded for readability; specimens are described in their typical habits, with the understanding that all marketplaces continue to evolve.

Amazon, Walmart, eBay & Etsy are trademarks of their respective owners
This is an independent informational comparison · No affiliation or endorsement
Not financial, business or commercial advice · Verify all figures independently
Set in Playfair Display, Crimson Pro & IBM Plex Mono · MMXXVI
End of Volume p. 32 ❦