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Amazon trounces rivals in battle of the shopping 'bots'

The company's technological edge has been good for its profit margin, and is proving a winning formula for investors

Bot-driven pricing has represented a massive change for the retail sector since Amazon helped pioneer it more than a decade ago.

San Francisco

EARLIER this year, engineers at Wal-Mart Stores Inc who track rivals' prices online got a rude surprise: The technology they were using to check several million times a day suddenly stopped working.


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