Paying to Save: The Economics and Psychology Behind Costco’s Membership Model

By Vrushti Patel

B.S. Finance | Class of 2025 | Rochester Institute of Technology

Why do consumers opt for a yearly fee for shopping at the retail store?

Most of the retail/departmental stores compete by drawing consumers through discounts, promotion, and convenience without any upfront payment. However, Costco charges an annual fee before making any purchases. Is it quantity or quality that attracts consumers? Is Costco's membership fee a financial investment or psychological commitment that changes how consumers shop?

Costco Gas Station at Campus Square Shopping Center. Photograph by Chris Light, via Wikimedia Commons, licensed under CC BY-SA 4.0.

From a financial perspective, membership fees are a source of steady income for Costco. It is claimed by Costco that the format of membership fees is critical to the profitability of Costco since it creates customer loyalty and generates ongoing membership fees. As of the third quarter of fiscal 2026, the renewal rate of membership in the US and Canada was 92.2%, while membership-fee revenue grew by 11% compared to last year due to signups, fee increases, and upgrading to executive membership. But the membership fee is more than an entry charge. Costco combines tangible financial benefits with consumer psychology, creating a business model that can strengthen both customer loyalty and the company’s financial position.

Inside a Costco warehouse in Mountain View, California. Photograph by Coolcaesar, via Wikimedia Commons.

The membership fee works because consumers receive something in return. A Gold star membership currently costs $65 annually, while Costco's executive membership costs an additional $65. Executive members can earn 2% reward on qualifying purchases, subject to the program’s limits. These benefits allow consumers to evaluate membership as a financial calculation, if the savings and rewards exceed the cost of membership, renewing appears economically rational.

Psychology may strengthen that calculation. Once consumers pay for membership they may become more motivated to use the benefits they have purchased. This can involve concepts such as mental accounting and the desire to maximize perceived value. A member might think, “I already paid for Costco, so I should shop there instead of somewhere else.” Behavioral economists often describe this tendency through concepts such as commitment and sunk-cost thinking. The result is not necessarily irrational behavior, rather the membership fee may encourage consumers to concentrate more of their purchases within Costco’s ecosystem.

That creates an economic advantage for Costco. Not only does Costco earn money from the membership fee, but it also benefits when the members buy grocery, gas, house products, and other items. According to Costco, frequency shopping grew by 3% in the first quarter of 2026 while membership fee earnings have risen by 14%. The model therefore creates a cycle, members perceive value, continue shopping, renew their membership, and provide Costco with recurring revenue and predictable customer demand.

Inside a Costco warehouse. Photo by Sean Lee via Unsplash.

The broader question is whether Costco’s success comes from the membership fee itself or from the relationship the fee creates between the company and its customers. The answer may be both. Not only is Costco using an entrance fee to get money out of its customers, but it is creating an economic transaction where the customers get discounts and rewards; the company gets loyalty.

Finally, this shows how economics and psychology are able to co-exist. The membership fee gives customers a reason to calculate savings, while the benefits and shopping experience give them reasons to return. The psychology may be simple, after paying $65 to join, finding cheaper gas can make that membership feel like a bargain. In that sense, Costco has managed to turn an annual fee into something remarkably powerful, a financial benefit that keeps consumers spending while making them feel like they are saving.

Sources

• “Costco’s Renewal Trends Point to Lasting Customer Loyalty.” Zacks, August 3, 2026.

• “What Is the Difference Between Each Type of Membership?” Costco Customer Service.

• “Costco’s Traffic Growth Signals Strong Member Engagement Trends.” The Globe and Mail.

• “Costco (COST) Q1 2026 Earnings Beat: E-Commerce Surges 20%, Membership Fees Jump 14% as Tariff Lawsuit Looms.”

• “Costco (COST) Q1 2026 Earnings Call Transcript.” The Motley Fool, December 11, 2025.