Costco inventory turnover vs Walmart
Costco turns its inventory 12.4 times per year versus Walmart's 8 times and Home Depot's 5 times, enabling a negative cash conversion cycle.
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Costco's Inventory Engine: The Negative Cash Conversion Cycle
At 57:30 · chapter starts 57:00
Drawing on an afternoon spent with Costco CFO Richard Galanti at the company's Issaquah campus, Ben details the mechanics of Costco's inventory miracle. Turning inventory 12.4 times per year means one full cycle every 26–27 days. With standard net-30 supplier payment terms, Costco sells its inventory before the invoice is even due — and on some fast-moving items, turns the goods 2–3 times before paying. This is a textbook negative cash conversion cycle: the company literally has $0 tied up in inventory on average, and makes a small profit on the float. The contrast with how other retailers achieve similar results is important — many extract long payment windows through supplier pressure. Costco does it using entirely standard terms, purely through the combination of the warehouse model (goods available for sale the moment they arrive) and the brutally low SKU count that concentrates volume on each item. David's reaction is immediate: he has fully converted to Charlie Munger–level Costco enthusiasm.
The Negative Cash Conversion Cycle: Costco's Hidden Superpower
Costco turns its inventory 12.4 times per year — once every 26–27 days. Since supplier payment terms are typically net-30, Costco sells its goods before it ever pays for them, creating a negative cash conversion cycle. Unlike predatory retailers that extract 90–180 day payment terms, Costco achieves this purely through its low-SKU warehouse model.
3,800 SKUs vs 150,000: The Trade-Off That Makes Everything Work
Costco stocks just 3,800 SKUs — down from 4,500 a decade ago and still falling — versus 100,000–150,000 at a Walmart supercenter. This forces massive volume concentration on each item, which accelerates inventory turns, gives buyers negotiating leverage with suppliers, simplifies logistics, and enables the cross-dock distribution system. Every other Costco advantage flows downstream from this one choice.
Costco SKU count vs Walmart
Costco stocks only 3,800 SKUs versus 100,000–150,000 at Walmart, driving faster inventory turns and massive per-SKU volume.
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