Shrinking margins cloud Costco's profit beat, shares fall

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 265.84 +6.39 (2.46%)
Previous Close $259.45    52 Week High $847.21 
Open $260.85    52 Week Low $474.00 
Day High $266.40    P/E 450.58 
Day Low $258.58    EPS $0.59 
Volume 35,674,989       

Costco Co. (NASDAQ: COST) Delayed: 956.99 -4.36 (0.45%)
Previous Close $961.35    52 Week High $169.73 
Open $960.23    52 Week Low $138.57 
Day High $978.70    P/E 206.69 
Day Low $956.00    EPS $4.63 
Volume 1,641,897