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Sears Holdings Corp., which operates Sears and Kmart, said Thursday that it is closing 72 more of its stores. Here, shoppers look for deals at the last remaining Sears store in Chicago before it closes this summer. Patrick Gorski/NurPhoto via Getty Images hide caption

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Patrick Gorski/NurPhoto via Getty Images

Sears, once the monolith of American retail, says that there is "substantial doubt" that it will be able to keep its doors open. Company shares tumbled more than 12 percent Wednesday. Above, the department store's location in Brooklyn's Flatbush neighborhood today. Bebeto Matthews/AP hide caption

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Bebeto Matthews/AP