If you earn more than $125K and live in a city, you probably shop at Costco — not Sam's Club

If you earn more than $125K and live in a city, you probably shop at Costco — not Sam's Club

Dominick Reuter/BI (Sam's Club); Gene Puskar/AP (Costco)

On the surface, Costco and Sam's Club have a lot of similarities.

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