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This file photo shows Amazon鈥檚 sign pictured at the Amazon Fulfilment Centre in Peterborough, eastern England.聽 | AFP photo

E-commerce giant Amazon reported strong earnings Thursday but, like its big tech peers Microsoft and Google, saw its stock price fall on concerns over high AI investment costs.

The mounting expenses of data-intensive artificial intelligence and its infrastructure have cast a shadow over this earnings season, with only Facebook owner Meta winning Wall Street鈥檚 approval.