Latest / Business Strategy Talks with Fexingo: Competitive Advantage, Market Positioning, and Growth Planning / How Costco Builds a Moat in Retail Membership
Transcript
- Lucas: So this morning I was looking at Costco's latest quarterly numbers, and one figure jumped out at me: membership fee revenue was over a billion dollars last quarter, and almost all of that drops straight to profit. Luna: That's the real business, right? The stuff on the shelves is almost incidental. Lucas: Exactly. And that's what I want to dig into today — how Costco's membership model is arguably its deepest competitive moat. Most retailers compete on price or selection or convenience, and they all end up in a race to the bottom. Costco competes on a completely different axis. Luna: Yeah, the fee aligns everything. Customers feel like they have to shop there to get their money's worth, and Costco can keep prices low because the profit comes from the membership, not the margin on a jar of peanut butter. Lucas: If these conversations have helped you think differently about strategy, we'd love your support. It's what keeps the show ad-free and independent. You can find us at buy me a coffee dot com slash fexingo. Luna: Totally. Small thing, but it makes a big difference for us. Lucas: So back to Costco. The classic way to think about a moat is: can competitors replicate this? And the answer for Costco's model is surprisingly complex. On the surface, Sam's Club charges a membership fee too, so what's the difference? Luna: Well, Sam's Club is owned by Walmart, and Walmart's whole DNA is about selling as much stuff as possible. The membership fee at Sam's is almost an afterthought. Lucas: Right. At Costco, the fee is central. It's about $60 a year for a Gold Star membership, and about $120 for Executive. That fee covers about three-quarters of Costco's operating income. The merchandise margins are razor thin — typically around 11 to 14 percent, compared to 25 to 30 percent at a typical supermarket. Luna: So the incentive structure is completely different. Costco's buyers are rewarded for finding the best value, not for maximizing margin on each item. Lucas: And that attracts a certain type of shopper. Costco's customer base skews higher income — the median household income of a Costco member is around $100,000 a year. These are people who are price-sensitive enough to want a deal, but affluent enough to buy in bulk and pay an upfront fee. Luna: It's a self-selecting filter. You're not just paying for access — you're signaling that you're the kind of customer Costco wants. Lucas: Exactly. Now, the moat goes deeper than just the fee. There's the treasure hunt effect — Costco constantly rotates a small, curated selection of about 3,700 SKUs, compared to 30,000 or more at a typical Walmart. That scarcity and surprise drives frequent visits. Luna: And the Kirkland Signature brand. That's a huge part of it. Kirkland accounts for about 30 percent of Costco's sales now, and it's often higher quality than the national brand it replaces. Lucas: Kirkland is brilliant because it locks in loyalty. If you trust the Kirkland olive oil or the Kirkland vodka, you're less likely to shop around. And Costco controls the supply chain, so they can keep the quality consistent and the price low. Luna: Plus, it's a branding moat. You can't copy Kirkland — it's exclusive to Costco. Lucas: Now, here's where the flywheel kicks in. Lower prices drive more members. More members drive higher volume. Higher volume gives Costco more leverage with suppliers, which drives prices even lower. And that virtuous cycle is incredibly hard to disrupt. Luna: But it's not invincible, right? Amazon tried to compete with Amazon Fresh and Whole Foods, but they haven't really cracked the wholesale club model. Lucas: Amazon's approach is the opposite — infinite selection, convenience, no membership fee for grocery specifically. Costco is finite selection, you have to go to the store, and you pay for the privilege. Different philosophies. Luna: And Amazon's model doesn't create the same psychological lock-in. With Costco, you've already paid, so you feel compelled to keep shopping there to amortize that fee. Lucas: Behavioral economics calls that the sunk cost fallacy, but in this case it works in Costco's favor. Once you've paid the $60, you're more likely to make Costco your primary store. And the average member renews at over 90 percent. Luna: That renewal rate is insane. Most subscription businesses would kill for that. Lucas: And it's been stable for decades. Costco doesn't have to spend much on marketing — word of mouth and the membership model do the work. Customer acquisition cost is essentially zero. Luna: So the moat is a combination of economic incentives, brand trust, and operational discipline. But let's talk about a potential weakness: what happens if inflation or a recession hits? Lucas: Historically, Costco does well during recessions. People trade down from higher-end grocery stores, and Costco's value proposition becomes even more attractive. During the 2008 financial crisis, Costco's same-store sales actually grew. Luna: But what about the rise of discounters like Aldi and Lidl? They're also extremely efficient and offer low prices. Lucas: They compete on a different model too. Aldi has a small footprint, limited hours, and a very different shopping experience. Costco's warehouse experience — the samples, the treasure hunt, the bulk sizes — is a destination, not just a grocery run. That's hard to replicate. Luna: So the moat is partly experiential. Lucas: Exactly. Now, the biggest threat might be from within: if Costco raises fees too much or if the quality of Kirkland slips. But management has been disciplined. They've only raised the base membership fee five times in the last 30 years. Luna: And each time, they add value alongside the increase. The last time they raised the Executive fee, they also increased the reward percentage. Lucas: Right. So the moat isn't static — they actively reinvest in it. Think about what they do with their employees: Costco pays well above retail average, offers health insurance to part-time workers, and has very low turnover. That leads to better service and lower training costs. Luna: That's a cultural moat. Walmart tried to copy that with higher wages at some stores, but it's hard to shift a whole corporate culture. Lucas: And culture is one of those moats that's almost impossible to quantify in a spreadsheet, but investors see it in the results. Costco's return on invested capital is consistently above 20 percent, which is elite for retail. Luna: So when we look at Costco, the moat isn't just one thing. It's a system of interlocking advantages: the membership economics, the curated selection, the private brand, the employee culture, and the supply chain efficiency. Lucas: Exactly. And that's why competitors can't just copy the fee model and expect success. Sam's Club has tried for years, and while it's profitable, it hasn't matched Costco's loyalty or margins. Luna: Because they're playing a different game. Sam's Club is still part of Walmart's ecosystem, and the incentives aren't fully aligned. Lucas: So the lesson for any business building a moat: find a way to align your incentives with your customers' interests in a way that creates a virtuous cycle. Costco makes money when customers win. That's the core insight. Luna: And it sounds simple, but executing it for decades is incredibly hard. Lucas: That's why it's a moat.