"I knew Zooey's music from Elf, " recalls Ward, referring to the songs her shop-clerk character sang in the Christmas comedy starring Will Ferrell.

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Perhaps you went from shop to shop in the mall and asked each manager for work as a clerk.

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In a shop, where the scanner sits by the till and is supervised by a clerk, a thief could not make repeated payment attempts without raising suspicion, so false positives are unlikely.

ECONOMIST: Security