The risk isn't a recession. Recessions help Costco. The risk is whether trust ever breaks.
↓ the brief below
The market premium · what's already priced in
high
P/E
Costco trades at one of the highest multiples in retail. That premium already assumes the renewal rate stays at 93%+ forever. Any crack and the stock unwinds fast.
Costco continues to invest in e-commerce capabilities. E-commerce sales growth has lagged the industry, and the company acknowledges digital execution as an ongoing focus area.
↳ In English: Amazon owns the digital warehouse business. Costco's e-commerce is fine, not great. If younger members start shopping mostly online, the warehouse model gets tested.
Costco's entire profit engine runs through one mechanism: the annual membership fee. If renewal rates fell from 93% to even 85%, profit math gets ugly fast. There's no Plan B.
Wall Street calls this
Concentration risk
A model this dependent on *one number* is fragile in a specific way — even when the surface looks rock-solid.
From the 10-K · what Costco itself says
A reduction in member renewal rates or a deceleration of new member growth could materially harm our results. Our business model depends on continued member loyalty.
↳ Costco itself names this as the central risk. Watch the renewal-rate disclosure every quarter — if it ticks down, the story changes.