Retailers around the world are radically reshaping their strategies to contend with Amazon. Costco has a different tactic: Perfect what's been working for four decades.

Retailers around the world are radically reshaping their strategies to contend with Amazon. Costco has a different tactic: Perfect what's been working for four decades.

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How Costco thrives in the Amazon era

Retailers around the world are radically reshaping their strategies to contend with Amazon. Costco has a different tactic: Perfect what's been working for four decades.