More than half of restaurant workers are considering quitting because of low wages and other opportunities, according to a survey published last month by nonprofit One Fair Wage and the University of California at Berkeley’s Food Labor Research Center.

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Yet he and other employers in the industry face a more fundamental challenge. Low-skilled workers are fleeing food service for higher-paying jobs at fulfillment centers operated by Amazon .com Inc. and other retailers, according to Daniel Zhao, a senior economist at the employment site Glassdoor.