Dollar General's estimate-topping performance in the previous quarter and positive management commentary pushed the stock near its 52-week highs. However, the company remains cautious about its performance going forward and didn't boost its outlook. Stiff competition Dollar General competes with the likes of Wal-Mart Stores, Inc. (NYSE: WMT ) and other dollar stores and competition in this space is stiff. In May this year, Bloomberg reported that prices at Wal-Mart are lower than Dollar General in most categories. Wal-Mart Stores, Inc. (NYSE:WMT) beat Dollar General on pricing in household goods 100% of the time while other items such as grocery, auto supplies, etc. were cheaper 85% of the time at Wal-Mart Stores, Inc. (NYSE:WMT).