At fine-dining places, white workers overwhelmingly fill jobs with the heftiest salaries, while Latinos, blacks and other minorities have jobs with pay closer to the poverty level, a study finds. iStockphoto hide caption

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Fast-food workers in Los Angeles march in August 2013 to raise the minimum wage to $15 an hour. Similar protests around the country have been organized by labor unions. Nick Ut/AP hide caption

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Srirupa Dasgupta opened Upohar, a restaurant and catering service, with a social mission. Her employees — primarily refugees — earn double the minimum wage. Jeff Brady/NPR hide caption

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A Denny's waitress delivers breakfast to customers in Emeryville, Calif. The tipped minimum wage has been stuck at $2.13 since 1991. Justin Sullivan/Getty Images hide caption

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Fast-food workers march toward the Smithsonian's National Air and Space Museum in Washington, D.C., on Thursday. Similar rallies occurred in about 100 cities across the U.S. Morgan Walker/NPR hide caption

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McDonald's USA President Jeff Stratton responds to an employee who burst into an event. YouTube screengrab hide caption

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A group that advocates on behalf of food service workers has created an app that helps diners find restaurants that pay their workers livable wages and offer room for advancement. hide caption

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Culinary student Nadya Dunkley cooks chicken at Colors Restaurant in New York. The restaurant scored highly in a new guide that rates restaurants based on the way they treat employees. Kathy Willens/AP hide caption

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