The Costco Model
Sell cheaper than anyone, turn stock before you pay for it, never raise the margin.
- Difficulty
- Expert
- Time to result
- ~ongoing to results
- Steps
- 7
- Confidence
- 70%
Munger's account of Costco is a self-funding loop rather than a merchandising trick. A deliberately narrow assortment produces very high turnover on each item; high turnover means goods sell before supplier invoices come due, so the warehouses are full of merchandise that never sits on the balance sheet; that removes the need for inventory capital, which allows prices genuinely lower than anyone else in the country; low prices bring the volume that sustains the turnover. Two norms protect the loop. The margin is set low and frozen permanently, so no one is ever tempted to take price and break the customer's trust. And expansion is capped at the rate new stores can be staffed and taught, roughly ten percent a year, because capital was never the constraint. Munger stressed the pieces are obvious; assiduous daily execution for forty years is what nobody copies.
Origin
Extracted from Acquired, where Charlie Munger, a Costco director, walked through why the model works, why Home Depot and Floor & Decor could copy it, and why Walmart never did.
Core principles
- 01A permanently low margin is a moat, not a concession.
- 02Inventory the supplier finances is leverage without debt.
- 03Fewer SKUs means higher turnover, which is what makes the whole model fund itself.
- 04The good locations and the affluent bargain-hunter are worth paying up for.
- 05Execution repeated for decades, not the idea, is the scarce part.
How to run it
- 1
Cut the SKU count
Restrict the assortment to a small number of items bought in enormous quantity. Low SKU count is what makes per-item turnover high enough for the rest of the model to work.
Pro tip Judge each SKU by turns, not by gross margin contribution.
- 2
Sell the goods before you pay for them
Structure supplier terms so payment falls due after the merchandise is scheduled to sell. The warehouses can then be full of high-quality goods that never appear as inventory on the books.
Pro tip This is real leverage without debt; treat it with the same caution you would a loan.
Watch out The terms only hold while volume and turnover hold; a slowdown converts the advantage into a cash squeeze.
- 3
Set the margin low and freeze it
Make the low margin a permanent norm rather than a number reviewed each year. Munger described the central norm as: do not raise the margin, get it low and keep it there forever.
Pro tip Publish the norm internally so a future manager cannot quietly reverse it.
Watch out A single well-argued price rise can destroy a reputation for price that took decades to build.
- 4
Pay up for the right locations and the right customer
Site the business where affluent but price-conscious customers are, and build large efficient stores with generous parking. Munger noted Costco's parking spaces were ten feet wide when the norm was under nine.
Pro tip The target is the rich customer who still wants to save money, not the poorest customer.
- 5
Reward the heavy users and screen out the rest
Use membership tiers and reward points to concentrate traffic on customers who buy in volume, and keep out the low-volume traffic that clogs the format without paying for it.
Watch out Resist schemes that monetise the site or the parking; they import traffic that pays you very little and degrades the experience.
- 6
Grow only as fast as you can teach
Cap expansion at the rate you can supply new managers, new local knowledge and new process. Munger pointed out Costco is not capital constrained; free money would not let it open more stores.
Pro tip Treat trained managers, not cash, as the growth budget.
- 7
Refuse the miscellaneous
Reject adjacent categories that dilute the assortment and slow turnover. Munger's warning about Costco's imitators was that it is the miscellaneous stuff that eventually kills you.
Pro tip Set a hard ceiling on total SKUs so every addition forces a deletion.
In the wild
Munger described the group around Home Depot deciding to copy the Costco model in home improvement. Bernie Marcus visited Sol Price before starting, and Price was happy to share the playbook. The copy was direct: large efficient stores, deep buying, low prices held permanently, and a format built for customers arriving with a truck. Munger called it one of the easiest big opportunities he had seen, and noted how much money the founders made from it, while conceding it was not entirely obvious at the time because Costco's appeal was horizontal breadth and Home Depot's was a single vertical.
→ A category-defining retailer built by transplanting an existing operating model into a new vertical.
Munger's explanation for why Walmart never beat Costco was habit rather than capability. Walmart had learned to get real estate for almost nothing in small towns, so its occupancy costs were near zero, and it knew how to run big division stores. Paying up for good locations in wealthy suburbs offended that formula. Costco specialised in exactly those locations, and Walmart let it happen year after year. Munger's generalisation was that the play space was occupied by an old idea, which he called everybody's trouble.
→ A far larger incumbent conceded the affluent warehouse-club position for decades.
Common mistakes
Taking price once the model works
Raising the margin harvests a few points of profit and breaks the price reputation that produced the volume. Munger's Costco hot dog example is the norm working precisely because nobody is allowed to touch it.
Adding miscellaneous categories
Each unrelated addition lowers turnover and pushes the business back toward carrying its own inventory. Munger flagged this as the thing that eventually kills the imitators.
Treating capital as the growth constraint
The binding constraint is trained managers and transferred process, not money. Funding faster expansion than the organisation can teach produces weak stores that dilute the format.
Is it for you?
Best for
High-volume physical or commerce businesses where scale purchasing and fast turnover can be traded directly for price.
Not ideal for
Brand, style or low-turnover businesses whose value comes from scarcity and price rather than volume and cost.
From the transcript
“They've got 900 warehouses around the world full of high quality merchandise, none of which they have sitting on their books.”
“I would say the the central norm was don't raise the margin. Get it low and keep it there forever.”
“You really have to set out to do it and then do it with an assiduousness every day, every week, every year for 40 years.”
From the episode
Charlie Munger
Charlie Munger