(Bloomberg) -- Dollar General Corp. is quickly losing fans on Wall Street after cutting its profit forecast for a second straight quarter as the discount retailer faces increased competition while economic pressure builds on consumers.Most Read from BloombergSaola Weakens After Bringing ‘Destructive’ Winds to Hong KongSingapore Picks Tharman as President in Ruling Party BoostEurope's Biggest Oil Company Quietly Shelves a Radical Plan to Shrink Its Carbon FootprintTesla Refreshes Model 3 and Slas