I share my notes from a fascinating interview with Mark Williamson, the leader of Costco's Retail Media Network, which aired on the Middlemen podcast. While most retailers rush to monetize every pixel they own, Costco has taken a deliberately slow approach as a "last mover" in retail media.

My Three Key Takeaways:

Membership First, Media Second
Costco evaluates every retail media decision through the lens of their member promise
They believe their restraint creates scarcity, making their offerings more valuable
Their simple value proposition: relevant messaging should drive traffic, shops, and sales

Merchants Rule the Kingdom
Unlike competitors who position retail media as standalone businesses, Costco keeps merchants at the center
They've built a "Growth Team" to connect traditional merchant relationships with agency-driven opportunities
Media investments must demonstrate actual sales growth for Costco, not just profits for the retail media network

Performance Over Profit Margins
Costco recommends what works best for suppliers, not what maximizes their own margins
When suppliers have budget to spend, they might recommend endcaps or sampling instead of higher-margin digital options
This straightforward approach to value builds advertiser trust that will serve them well as their retail media offerings mature

Costco's approach stands in contrast to other retail media networks that have become increasingly complex and opaque. By keeping the member promise sacred and measuring success in sales rather than network margins, Costco has created a retail media network that advertisers are eager to work with.

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