The reaffirmation of guidance suggests that Dollar General is on track to meet its sales targets, which is a positive signal for stability. However, the potential decline in same-store sales indicates that growth may not be robust, which could temper investor enthusiasm. The news is highly relevant as it pertains directly to Dollar General's financial outlook, and it is important for investors as it provides insight into expected performance. The confidence level is high due to the specificity of the guidance provided by the company.