How Costco Bet Against Discounting?

When Jim Sinegal opened the first Costco warehouse in 1983, he walked into a retail world that operated on a simple law: make money by marking up products as high as you can. Supermarkets used loss leaders to draw shoppers in, then buried the profits in other aisles. Traditional discounters competed on price but survived on volume and thin margins. Sinegal had a different idea. He would charge customers upfront to shop there, then run the warehouse itself on razor-thin margins. That inversion of the retail playbook became the foundation of one of America's most successful and misunderstood companies. The membership model was not new Warehouse clubs existed before Costco. But they were regional, loosely run, and often chaotic. Sinegal, who had worked at FedMart and Price Club, saw the potential for a better version. The membership fee would do two things at once: it would create a committed customer base that felt they had skin in the game, and it would let the company make money on membership alone, which meant the warehouse itself could run on razor-thin margins. That freed Costco to price goods far below what other retailers charged. The margin philosophy was radical Costco's internal rule was simple: no product would be marked up more than 15 percent, and most items were marked up only 10 to 11 percent. In traditional retail, 30 to 50 percent markups were standard. Competitors thought Sinegal was running a nonprofit. But the membership fees, the high traffic volume, and the reduced costs of operating a warehouse model meant Costco actually made money. The low prices kept customers coming back, and the predictable stream of membership revenue meant the company could think long term instead of quarter to quarter. The selection paradox Costco limited its inventory dramatically. A typical supermarket carried 40,000 products. Costco carried only about 3,500 to 4,000. This seemed backwards. Sinegal believed that fewer choices actually served customers better. It meant Costco could negotiate far better prices with suppliers because they were buying in larger volume. It also meant less complexity on the warehouse floor, which meant faster inventory turns and less waste. The limited selection became a feature, not a bug. Word of mouth and expansion Costco did not spend heavily on advertising. Instead, the company relied on members telling friends that they could buy quality goods at unexpectedly low prices. The membership model created a natural incentive for members to get their money's worth, which meant they shopped more often and in larger quantities. By the 1990s, Costco was expanding aggressively, and the formula was proving itself. Competitors tried to copy it, but few could sustain the discipline of such low margins and high volume. The strategy stayed alive Sinegal ran Costco for decades and passed the role to Craig Jelinek, who maintained the core philosophy. Even as e-commerce disrupted retail and Amazon forced price wars across ca