Wal-Mart's New CEO Has to Take On Amazon and Unions

Wal-Mart's new CEO faces stiff challenges from competitors and labor unions.

Yesterday, Wal-Mart Stores Inc. surprised everyone when it announced that its current chief executive officer, Mike Duke , would step down. He'll be replaced by Doug McMillon , a career insider who has been touted as a possible future CEO for a while -- but not, until yesterday, the very immediate future.

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