U.S. discount retailer Dollar General continues to achieve robust sales and cash flow growth We are raising the corporate credit rating to investment-grade 'BBB-' from 'BB+'. At the same time, we are removing all ratings from CreditWatch with positive implications. The stable outlook reflects our view that positive operating momentum will drive healthy sales and cash flow growth in 2012, resulting in credit protection measures in line with an "intermediate" financial risk profile. NEW YORK (Standard&Poor's) April 30, 2012--Standard&Poor's Ratings Services said today that it raised its rating on discount retailer Dollar General Corp., including the corporate credit rating to 'BBB-' from 'BB+'. At the same time, we removed the ratings from CreditWatch with positive implications,