Latest / Business Strategy Talks with Fexingo: Competitive Advantage, Market Positioning, and Growth Planning / How Costco Builds a Moat in Retail Efficiency
Transcript
- Lucas: Warren Buffett once said that when he sees a really good business, he wants to buy it and never sell. And he's said that about a handful of companies over the years. One of them is Costco. But what's weird is — Costco doesn't have a patent. It doesn't have proprietary technology. It doesn't have a network effect the way a social platform does. So what exactly is its moat? Luna: I think most people would say it's the membership model. But that's just the surface. The real moat is something much more structural. Lucas: Exactly. Let me give you the single most important number in the Costco story: 14 percent. That's the maximum gross margin the company allows on any branded product it sells. Not a target. A ceiling. The company literally has a policy that no item can carry a markup higher than 14 percent over cost. Luna: That's insane. Most retailers operate at 35 to 50 percent gross margins. Even Walmart runs around 25 percent. Lucas: Right. And Costco's overall gross margin — across everything — is typically around 12 to 13 percent. That's less than half the industry average. So how does a company that caps its markup survive, let alone thrive? The answer is the membership fee. Luna: That's the profit engine. Costco essentially breaks even on the merchandise. All the profit comes from those annual fees. Lucas: Precisely. In fiscal 2025, Costco generated about $250 billion in revenue from merchandise. Membership fee revenue was roughly $5 billion. But here's the kicker — almost all of that $5 billion flows straight to the bottom line as operating profit. So Costco can afford to sell goods at near cost because the membership fee is where they make their money. That creates a structural advantage that's incredibly hard to replicate. Luna: And that structure creates a flywheel. Low prices drive membership growth. More members drive volume. Volume drives bargaining power with suppliers. Bargaining power drives even lower prices. Round and round. Lucas: But there's another layer to the moat that doesn't get enough attention: the treasure hunt. Costco deliberately keeps its inventory limited to about 3,700 SKUs. Compare that to a typical Walmart supercenter, which carries around 120,000. By limiting choice, Costco simplifies its supply chain and increases inventory turns. Luna: And those turns are crazy high. Costco turns its inventory about 12 times a year. Walmart turns about 8. Target turns about 6. That means Costco's cash conversion cycle is incredibly efficient. Lucas: But the limited SKU count also creates a behavioral effect. When you walk into Costco, you're not just buying what you came for. You're browsing a curated selection that changes frequently. That massive flat-screen TV, the wine selection, the seasonal items — they rotate. That creates urgency. You don't know if that deal will be there next week. So people buy more. Luna: I've definitely bought things at Costco that I didn't plan to, just because they seemed like a one-time opportunity. Lucas: That's the treasure hunt. And it's a moat because it's not just a tactic — it's embedded in the operating model. The limited SKU count, the palletized display, the membership gate — all of it reinforces the behavior. Luna: But what about Kirkland Signature? That's a huge part of the moat too. Lucas: Huge. Kirkland Signature is Costco's private label, and it now accounts for over 25 percent of sales. Most retailers use private label as a low-cost alternative. Costco uses it as a quality anchor. They position Kirkland against national brands, often with better specs — like using higher-grade olive oil or stronger trash bags — and sell it at a lower price. It builds trust. And once a customer trusts the store brand, their loyalty deepens. Luna: And that trust is reinforced every time you buy something like the $1.50 hot dog and soda combo. Which, by the way, has been that price since 1985. Lucas: That hot dog is almost a symbol of the entire strategy. Costco's CFO has said publicly that they would rather lose money on the hot dog than raise the price. Because the hot dog is a signal: 'We are on your side.' That kind of brand equity is a moat that's nearly impossible to copy. Luna: And if what we're talking about today is actually useful to you — if you're thinking about how to apply these ideas to your own business or just understand retail better — the way these conversations stay ad-free is listener support. You can buy us a coffee at buy me a coffee dot com slash fexingo. No pressure, just if you get value. Lucas: Yeah, we keep it clean and independent, and that's only possible because of people who chip in. So if today's episode moved your work forward in some small way, that link is there. Luna: Alright, back to Costco. So we've got the pricing cap, the membership flywheel, the treasure hunt, and Kirkland. But there's a fifth element that often goes unnoticed: employee retention. Lucas: That's key. Costco pays its warehouse workers an average of over $25 an hour, which is significantly above the retail industry average. They also offer health insurance to part-time workers. Turnover is around 8 to 9 percent annually, compared to the retail average of over 60 percent. Luna: That low turnover means lower training costs, more experienced employees, and better customer service. But it also means something else: institutional knowledge. Employees who've been there for years know the inventory, the customers, the rhythm. Lucas: And that's actually a moat because it's a choice. Most retailers treat labor as a cost to be minimized. Costco treats it as an investment. And that's hard to reverse once you've built that culture. If Walmart tried to suddenly match Costco wages, it would cost them billions and upset their entire operating model. Luna: So the moat is really a system of interconnected decisions. You can't just copy one piece — you'd have to adopt the whole philosophy. Lucas: Right. And that's what makes it durable. Let's talk about a recent stress test: inflation. Over the past couple of years, everyone felt the pinch. Costco had to make choices. Did they maintain the 14 percent cap? Largely, yes. They absorbed some cost increases and passed on others but stayed disciplined. Meanwhile, traditional grocers were raising margins to protect profits. Luna: So in a high-inflation environment, Costco's relative value proposition actually strengthened. More people saw the membership fee as a smart hedge against rising prices. Lucas: Exactly. Membership renewal rates actually ticked up. The US and Canada renewal rate is now over 92 percent. That's extraordinary. And it speaks to the loyalty that the model creates. Luna: But there's a looming threat: e-commerce. Costco's online business is growing, but it's a much smaller share of sales compared to Amazon or Walmart. Can the warehouse club model work in a digital-first world? Lucas: That's the question. Costco's online sales were about $12 billion last year, out of total revenue of $250 billion. So it's about 5 percent. But here's the thing — Costco's model is built on the physical warehouse experience. The treasure hunt, the impulse buys, the massive packaging — that doesn't replicate online easily. Luna: They have made moves. They acquired Innovel Solutions, a logistics company, to improve e-commerce fulfillment. And they've expanded their two-day delivery program. But fast, free shipping on a 48-pack of toilet paper isn't easy to profit from. Lucas: And that's where the moat might have a weakness. If consumers shift permanently toward online shopping for bulk goods, Costco's physical advantage could erode. But I'd argue that the social and experiential component — the weekend trip to Costco — is a habit that's deeply ingrained for millions of households. Luna: There's also the demographic angle. Costco's core customer is higher-income than the average Walmart shopper. The typical Costco member has a household income over $100,000. That customer base is more resilient to economic downturns and more likely to value the experience. Lucas: That's a crucial point. Costco isn't competing for the lowest-income consumer. It's competing for the value-conscious premium consumer. That's a different game. And it gives them pricing power and margin flexibility. Luna: So if I were a competitor trying to attack Costco's moat, where would I start? Lucas: You'd have to be willing to lose money on merchandise for years while building a membership base. That's a huge upfront investment. And you'd need to replicate the supplier relationships that Costco has built over decades. That's not impossible, but it's very, very hard. Luna: And you'd have to match the employee culture. That might be the hardest part. Lucas: Because culture isn't something you can buy. It has to be built over time. And Costco has been doing this since 1983. That's 43 years of compounding the same philosophy. Luna: So the moat is really time plus discipline. You can't shortcut time. Lucas: I think that's the takeaway. When people look for moats, they often look for patents or network effects. But some of the strongest moats are operational: a system of choices that reinforce each other and become harder to replicate the longer they're in place. Luna: And Costco is a great example of that. It's not flashy, but it works. And it's been working for decades. Lucas: So the question I'll leave you with is: what's your 14 percent cap? That one constraint that shapes every other decision you make.