Wal-Mart challenges Amazon with unlimited shipping service for $50 per year

Wal-Mart Stores Inc is planning to test a new unlimited online shipping service this summer for $50 per year, a move that may hurt Amazon's annual $99 Prime shipping service. Wal-Mart's service, which will be by invitation only for now, will offer selected products on the company's website to customers within three days or less, company spokesman Ravi Jariwala told Reuters

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