Businesses do not always continue with an idea because it is working.
Sometimes they continue because they have already invested too much in it.
Money is the obvious version. But sunk cost can also be time, effort, reputation, internal politics, technology, relationships or simply the emotional investment attached to a decision.
Once a business has spent months building a product, years developing a market or a significant budget on a campaign, stopping can feel like admitting failure.
That creates a subtle problem.
The original decision starts receiving protection from the people who made it.
Instead of asking “Is this still the right direction?”, the organisation starts asking “How can we make the direction we chose work?”
Those are very different questions.
A marketing campaign can face the same problem. If a company has invested heavily in a particular positioning, it may keep producing variations of the same message even after customer behaviour suggests that the positioning is not working.
A product team can keep adding features because abandoning the product would make previous development work feel wasted.
A business can continue paying for a channel because leaving it would force an uncomfortable conversation about the money already spent.
But past investment cannot be recovered by making a poor decision today.
The useful question is not how much has already been invested.
It is what the next unit of investment is likely to produce.
That does not mean businesses should abandon every difficult project at the first sign of resistance. Some ideas need time. Brand building takes time. New products often take time. Experiments can fail before the learning becomes useful.
The distinction is between persistence and attachment.
Persistence responds to evidence: the strategy is difficult, but there are signs that it is moving in the right direction.
Attachment responds to history: we have already come this far, so we must continue.
Good decision-making requires the ability to separate the two.
Sometimes the most responsible business decision is to continue.
Sometimes it is to change direction.
And sometimes the reason a decision feels impossible to change is simply that too much of the past is sitting inside it.