Share prices of Dollar General (DG -1.40%) are up a little more than 25% so far in 2025. The S&P 500 index (^GSPC 1.67%), meanwhile, has fallen roughly 8%, after having dipped deep into correction territory at various points in the year. That's a 30-plus percentage point outperformance for the low-price retailer.Let's look at why this difference makes total sense and why there's more than one tailwind for investors to consider when it comes to Dollar General stock.What does Dollar General do?As Dollar Gener ...