Trader Joe's long-established strategy of providing unique products -- such as Greek-style yogurt, 10 kinds of hummus and a "low-sudsing," biodegradable house-brand laundry detergent -- at affordable prices has worked well for the grocery chain. The company's stores carry about 2,000 products, compared with 30,000 in a typical supermarket, and about 80% of those goods are private-label.

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