Shares of Dollar General (DG) - Get Report were lower during mid-morning trading on Thursday following a downgrade to "underperform" from "neutral" with a $62. price target at Credit Suisse. 

"DG's comps at mature stores turned negative and margins have declined, due in part to increased price competition. While management seemingly expects the environment to normalize after 2017, this is unlikely given competitors' focus on food and consumables to drive traffic," Credit Suisse analyst Edward Kelly wrote. 

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