Which retail innovation did Costco pioneer that significantly contributed to its success and is now widely imitated across the retail industry?

Warehouse clubs have transformed the retail landscape by offering bulk products at discounted prices through membership models. These retail giants have created unique customer experiences that blend value, selection, and exclusivity. Test your knowledge about one of the most successful warehouse club chains and its innovative business approach that disrupted traditional retail.

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The "treasure hunt" merchandising strategy with rotating luxury items
The first retail membership program with annual fees
The introduction of in-store food courts as customer retention tools
The first private label brand (Kirkland Signature) to emphasize quality over price