The most costly manager is not necessarily the one who makes the biggest mistake. Far more costly may be the one who causes people you could not afford to lose to leave the company.
Such managers often arrive with a confidence that feels like relief to a tired owner. They speak convincingly, offer order, structure and results, and easily give the impression that they will finally take on some of the burden that has rested on the owner’s shoulders for years. At the same time, the people who have long carried the real work begin to withdraw. They do not leave immediately. First they try to explain, then they warn, then they stop making suggestions, and eventually they simply do what they are told.
From the outside, everything still looks calm. Work continues, meetings are held, reports arrive. But the person who once thought as though the company were theirs too now simply completes the task. Only when they leave does it become clear how much they knew, how many relationships they maintained, how many problems they solved before anyone else even knew those problems existed, and how many years of experience lived in things that could not fit into any report or handover meeting.
The easiest thing then is to blame the manager. To say they did not understand the company, its people or its culture. All of that may be true, but there is a more uncomfortable question: where was the owner during that time?
Anyone can make a poor judgment. The real problem begins when the owner starts defending their decision more than the people telling them that decision is causing harm. A warning then begins to look like resistance, criticism like disobedience, and the experience of people who have spent years building the company becomes less important than the confidence of someone who has only just arrived. At that point, the owner is no longer protecting the manager. They are protecting their own judgment. And the company can pay a very high price for that.
The wrong manager can cause harm. An owner who keeps making excuses for them for too long turns that harm into a message to the entire organisation: whose word matters, whose experience counts, and whether there is any point at all in saying what no one wants to hear.
That is why an owner’s most costly mistake is not always the person they chose badly. Sometimes the person they lost because of that choice costs them far more.
You can find a new manager. You can write a new strategy. You can change procedures. But years of knowledge, relationships, trust and belonging do not return with a single job advertisement.
We only begin to value some people after they leave. And then we are no longer talking about their value.
We are talking about the cost of our own mistake.
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