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Costco is cracking down on non-members who use someone else's membership card to enter the store.
The company has noticed an increase in non-members sneaking in with membership cards, especially since the expansion of self-checkout.
To combat this, Costco has started asking for shoppers' membership cards and photo IDs at the self-checkout registers.
They are also testing a new system that requires members to scan their membership cards at the store entrance.
Costco's membership model is crucial to its business, and any changes to membership growth or renewal rates could impact the company's profitability.
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