Shrinking margins cloud Costco's profit beat, shares fall

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Amazon.com Inc (NASDAQ: AMZN) Delayed: 260.11 -5.73 (2.16%)
Previous Close $265.84    52 Week High $847.21 
Open $263.16    52 Week Low $474.00 
Day High $263.84    P/E 440.86 
Day Low $259.52    EPS $0.59 
Volume 28,348,969       

Costco Co. (NASDAQ: COST) Delayed: 933.51 -23.48 (2.45%)
Previous Close $956.99    52 Week High $169.73 
Open $931.15    52 Week Low $138.57 
Day High $944.22    P/E 201.62 
Day Low $925.77    EPS $4.63 
Volume 2,503,279