Understanding the Problem: The declining profits in mature product offerings indicate a potential issue that can be influenced by both sales and supply chain management. Effective collaboration is essential to identify and address the root causes.

Relationship Dynamics: The strained relationship between the supply manager and the sales director needs to be addressed constructively. Offering to work together can help mend this relationship while focusing on the common goal of improving profitability.

Collaboration Benefits: By working together, the sales director and supply manager can leverage each other's expertise. The supply manager can provide insights into cost reduction, supplier negotiation, and inventory management, while the sales director can focus on market strategies and customer needs.

Strategy Alignment: Joint solutions ensure that the strategies developed are aligned and integrated, leading to more coherent and effective implementation.

References: Effective leadership and transformation management practices emphasize collaboration and relationship building. This approach aligns with best practices as outlined in various leadership and management frameworks, such as Kotter's Change Management Model and the principles of Transformational Leadership.