LONDON : Global shares slid on Thursday, after Facebook owner Meta Platforms and Microsoft both warned of accelerating costs for artificial intelligence, while evidence of strong U.S. economic growth kept the dollar underpinned. Big Tech's warnings stoked worries among investors that the pay-off for heavy spending on AI may take longer than many had hoped. And with Amazon and Apple due to report later in the day, the mood was cautious. In currencies, the dollar fell back from three-month highs

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