Wal-Mart announces second-quarter results Thursday. In its last earnings report, the discount retailing giant had turned in higher-than-expected sales at stores open more than a year, a key retailing metric. But Wal-Mart has been struggling to bolster its online sales, and its planned acquisition of the fast-growing e-commerce company Jet.com will take a while to bear fruit. And Wal-Mart may still feel a drag from higher labor costs, the result of investments in training and higher wages.

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