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Customers wait in line to check out purchases at Costco store on June 28, 2023 in Teterboro, New Jersey. Costco is cracking down on membership card sharing at its stores. 

Kena Betancur | Corbis News | Getty Images

Six quarters of shrinking margins among S&P 500 companies have ended — and according to a Barclay’s analysis, that flip has historically led to a higher market in the months ahead.

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