After arch-rival Live Nation bought Ticketmaster in 2010, AEG moved to build its own ticketing service, now called AXS Ticketing.

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Sainsbury, which is Tesco's arch-rival in Britain, is also using dedicated warehouses to try to build its Internet sales.

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"People didn't know if it was a nuclear-bomb facility, " says William Butterly about the temporary arch-shaped, steel-and-fabric hoop barn he had to build in his Fairfield, Conn.

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