Dollar General (DG) shares surged more than 10% after beating earnings estimates, fueled by a strong consumer and solid job market. Jan Rogers Kniffen says DG's success is a sign of a resilient lower-end consumer. With wage growth outpacing inflation and low unemployment, Kniffen expects other discount retailers like Dollar Tree (DLTR) and Five Below (FIVE) to follow suit. However, he does express concerns about the rising popularity of buy-now, pay-later services like Affirm (AFRM) and Klarna, which could lead to increased financial pressure on consumers if not managed carefully.