Shortly after 7 p.m. on Monday, 12,000 FedEx employees in Memphis stretched and flexed in concert and gulped holiday-colored sports drinks in preparation for processing 7,000 packages a minute. At United Parcel Service air headquarters in Louisville, Ky., employees are poised to handle 100,000 boxes from Zappos, the online shoe emporium just 12 miles away. To release holiday tension, some Zappos …
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