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When one customer decision can move many accounts
I examine the funding question that sits between treasury models and relationship knowledge: who can decide to move a material balance, and what might prompt that decision? The session follows a fictional commercial-bank deposit review from account records to connected ownership and withdrawal authority. Participants consider what a relationship manager may know, the assumptions a model may contain and the gaps neither function can close alone. I discuss the economic cost of diversification, including the possibility of losing associated business, and how to make that trade-off visible to directors. The aim is to help an executive team ask better questions about a concentration it already understands imperfectly. I do not offer a formula for an acceptable deposit mix or advice about a particular institution. The discussion is most useful when participants bring a question about governance, evidence or decision ownership rather than confidential customer data. We finish by identifying one assumption that deserves a joint treasury and commercial review before the next planning cycle.