With over 55 million members worldwide and a 90% renewal rate, costco has cracked the code.

Verkkothe warehouse retailer has built up a loyal following of shoppers over the decades it's been operating.

Verkkoa new ranking shows costco has the most loyal customers of any retailer.

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Here's how they increase customer loyalty, even in difficult times.

Verkkocostco has managed to hang onto a very loyal customer base, who pay $60 a year to come shop at the chain, even with stiff competition from amazon.

Verkkocostco's secret weapon is its membership model.

It has low prices, rarely raises its membership.

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