Sears and other retailers - especially low-end ones - are hurting their own bottom lines by under-investing in their stores and employees, says Zeynep Ton, author of the "The Good Jobs Strategy". Ton, an MIT professor, explains how Costco improved its profits by reducing the number of brands on its shelves and increasing its worker's paychecks in relation to its competitors. Ton also says the formula for "The Good Jobs Strategy" applies not just to low-end retail but to manufacturing and industrial jobs as well.

Disclosure: TheStreet's editorial policy prohibits staff editors and reporters from holding positions in any individual stocks.

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