Every so often, a business story looks small and turns out to be big. Costco — the warehouse club where you go in for paper towels and come out with a kayak — is partnering with DoorDash to offer delivery from its U.S. warehouse stores. Nationwide. A first for DoorDash, which said Costco was among the most searched retailers not yet on its American platform.
It sounds like a footnote. It isn’t. This deal is a window into how the most disciplined retailer in America thinks about growth, what delivery economics actually look like, and why investors pay a staggering premium for Costco’s stock. Let’s take it apart.
What happened
The partnership, detailed on Seeking Alpha’s Wall Street Breakfast on September 18, brings Costco’s warehouses onto DoorDash’s marketplace across the United States. It’s worth noting what this isn’t: Costco already delivers through Instacart and Uber Eats. This isn’t Costco discovering delivery — it’s Costco adding the last major delivery platform it was missing, the one its own customers were searching for.
For DoorDash, landing Costco plugs the most conspicuous hole in its retail lineup. For Costco, it’s another way to serve members who want the warehouse’s prices without the warehouse’s parking lot.
The real numbers
Here’s where it gets interesting. Costco’s stock trades at a price-to-earnings multiple of roughly 43x, versus about 14x for its sector — a premium of nearly 195%. Its PEG ratio (which adjusts for growth) sits at a 76% premium to peers. By every conventional valuation measure, Costco is expensive. Absurdly expensive, some would say, for a company that sells rotisserie chickens at a loss.
And yet the market keeps paying it. Why? Because Costco’s business model is one of the most remarkable machines in retail: membership fees — nearly pure profit — fund razor-thin margins on goods, which drive foot traffic, which drives more memberships. It’s a flywheel, and it has spun reliably for decades. Investors aren’t paying 43 times earnings for groceries. They’re paying for certainty.
DoorDash sits on the other side of the trade. Its shares are down nearly 20% over the past year and about 14% year to date. Seeking Alpha’s quant system rates it a Hold; Wall Street’s consensus is a Buy. Delivery is a brutally competitive, low-margin business — and partnerships like this one are how DoorDash tries to differentiate: exclusive-ish access to retailers its customers actually want.
Why it happened
Step back and the logic is almost elegant. Costco’s great strategic challenge is that its model depends on the trip — the treasure hunt through the warehouse. Delivery would seem to undermine that. But Costco has learned what every great retailer eventually learns: you don’t get to choose how customers want to buy. You only get to choose whether you’re there when they do.
There’s a defensive element too. Walmart and Amazon have spent years building delivery muscle. Every month Costco isn’t fully available on every major platform is a month a busy family might consolidate its shopping with a competitor. The DoorDash deal closes that gap.
And notice the sequencing: Costco didn’t build its own delivery fleet. It didn’t buy a startup. It partnered — the same playbook it used with Instacart and Uber Eats. Costco understands its core competence (buying and selling enormous quantities of goods at thin margins to loyal members) and rents everything else. That’s discipline, and it’s a big part of why the flywheel keeps spinning.
There’s a competitive subplot worth noticing, too. DoorDash didn’t win Costco by being the only delivery game in town — Instacart and Uber Eats got there first. It won by being the platform Costco’s own customers were already searching for, the missing piece shoppers kept asking about. In platform businesses, that kind of pull — customers demanding you carry a merchant — is worth more than any sales pitch. DoorDash’s shares may be down nearly 20% over the past year, but deals like this are how a delivery company builds a moat: not with technology, which everyone can copy, but with the accumulated weight of merchants customers refuse to shop without.
The lessons for the rest of us
For investors: Costco is the market’s favorite test of the question “does quality deserve any price?” At 43x earnings, the stock leaves no room for stumbles — Seeking Alpha’s own take was a “positive hold,” which is analyst-speak for “wonderful company, terrifying price.” The lesson isn’t to buy or avoid Costco. It’s that when you pay a premium, you’re buying the story continuing, not just the company as it is. Make sure you believe the story.
For business owners: Notice what Costco didn’t do. It didn’t chase a trend outside its competence. It found the cheapest, most reversible way to meet customers where they are — a partnership, not a build. When you’re tempted to build something big and new, ask first whether you can rent it.
For the rest of us: There’s something quietly hopeful about this deal. The most successful retailer in America got there not by squeezing customers but by being relentlessly on their side — low prices, generous returns, wages that keep workers around. The delivery deal is just the latest verse of the same song: make it easy for people to say yes. Businesses that do that tend to last. Portfolios built on businesses that last tend to do fine.
A warehouse, a delivery app, and a reminder that the boring companies are often the most interesting ones.
Deo Salvator’s note: this column is for understanding, not advice. Single stocks carry single-stock risk — diversify, and know why you own what you own.
