The expansion of Mike Creedon's role to include leadership of Merchandising and Supply Chain is a strategic move aimed at enhancing the operational efficiency and customer experience of Dollar Tree and Family Dollar. This change is likely to be viewed positively by investors as it signifies the company's commitment to its transformation strategy and operational improvement. Given Creedon's previous leadership roles and experience, this move could lead to improved performance and efficiency in these critical areas, potentially having a positive impact on the company's stock price in the short term.