Starbucks' CEO says infrequent customers are becoming more cautious spenders.
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- Amazon and Starbucks executives said Tuesday that US consumers had been tightening their purchases.
- Amazon's chief financial officer, Brian Olsavsky, said customers were trading down and looking for deals.
- Starbucks CEO Laxman Narasimhan said the coffee chain's customers were growing more cautious.
US consumers are becoming more prudent with their spending...