The story
Walmart is the largest company in the world by revenue — more than $680 billion a year — and it earns that not from any premium product but from being, relentlessly, the cheapest. Every week around 270 million customers visit its more than 10,750 stores across 19 countries. The whole enterprise is a single idea executed for six decades: drive costs lower than anyone else can, and hand the savings to customers as prices no rival can match.
Sam Walton opened the first Walmart in Rogers, Arkansas in 1962, betting that discount retail could thrive in the small towns big chains ignored. He grew by saturating regions around distribution centres, so logistics costs fell as store density rose — a flywheel that funded still-lower prices, which drew more customers, which justified more stores. Under Doug McMillon (2014–2026) Walmart bolted a serious e-commerce and technology operation onto that machine; John Furner, a Walmart lifer who started as an hourly associate in 1993, took the CEO chair in February 2026 to steer its AI-era transformation.
How it makes money
On thin margins at colossal volume. Walmart marks up less than almost any competitor and makes it back on the sheer scale of what moves through its stores and warehouses. The engine underneath is cost: enormous purchasing power that squeezes supplier prices, and one of the most efficient distribution and data operations in retail, so that 'everyday low prices' is a promise backed by a genuinely lower cost structure rather than by temporary discounts.
There is only one boss — the customer.Sam Walton
The moat
Walmart's moat is scale economies. Its size lets it buy cheaper, ship cheaper and spread fixed costs thinner than any rival, and those savings fund prices competitors can't profitably match — which protects the volume that creates the scale in the first place. It is a self-reinforcing loop that is extremely hard to break into, because a new entrant would need Walmart's scale to match its prices, and Walmart's prices to win the volume that builds scale. The main threat, Amazon, attacked from a different cost structure entirely, which is why Walmart's decade-long push into e-commerce and logistics has been existential rather than optional.
Key people
Sam Walton
Founder
Doug McMillon
CEO 2014–2026; led the digital transformation
John Furner
CEO from Feb 2026; Walmart lifer since 1993
Greg Penner
Chairman
The playbook
Key decisions & principles
Build a cost flywheel
Density around distribution centres lowered logistics cost as Walmart grew, funding lower prices that drove the growth. Engineer a loop where scale lowers your unit cost.
Make low price structural, not promotional
Everyday low prices work only because Walmart's costs are genuinely lower. A price promise you can't sustain on cost is a trap.
Start where incumbents won't fight
Walton built in small towns the big chains ignored, winning them uncontested before scaling up. Pick ground the strong won't defend.
Turn size into buying power
Walmart's volume lets it dictate supplier terms, a cost advantage that compounds with scale. Purchasing leverage is a moat in itself.
Reinvent before you're forced to
Facing Amazon, Walmart spent a decade rebuilding as an omnichannel retailer. Even a dominant moat must be re-dug when the cost structure of the attack changes.
What to read next
- Sam Walton: Made in America — Sam Walton with John Huey
- The Wal-Mart Effect — Charles Fishman
- The Everything Store — Brad Stone
Why this matters
The strategy behind this business connects to models and moats you can study:
Frequently asked questions
Why is Walmart so hard to compete with?
Scale economies: its size lets it buy and ship more cheaply and spread fixed costs thinner, funding prices rivals can't profitably match — which protects the volume that sustains the scale.
How does Walmart make money on such low prices?
Thin margins at enormous volume, backed by a genuinely low cost structure from huge purchasing power and highly efficient logistics.
Who is Walmart's CEO?
John Furner became CEO on 1 February 2026, succeeding Doug McMillon. Furner joined Walmart as an hourly associate in 1993.