Decision-Making Biases: Key Takeaway
Working with leaders, executives, and entrepreneurs for more than 20 years has taught me that poor decisions rarely look obviously poor when you make them. They usually come with convincing reasons.
Six common decision-making biases—confirmation bias, sunk-cost thinking, anchoring, Dunning-Kruger effect, availability bias, and black-and-white thinking—can distort what you notice, value, and choose.
Awareness alone isn’t enough. Better decisions come from deliberately challenging your thinking: seeking contrary evidence, questioning anchors, setting exit criteria, and creating alternatives.
The danger isn’t that these biases make you feel wrong. They make you feel certain when you have good reason to question yourself.
Thinking Clearly When Your Thinking Feels Right
The difficult thing about decision-making biases is that you don’t normally experience them as biases. You experience them as sound judgement.
You have evidence for your position. You remember examples that support it. You’ve invested heavily in a project and can articulate exactly why another six months will make the difference. Someone has given you a starting figure in a negotiation, and your counter-offer feels perfectly rational as you move away from it.
Nothing feels distorted. That’s why simply memorising a list of cognitive biases has limited practical value. Knowing the term confirmation bias doesn’t stop you from confirming what you already believe. Knowing about sunk costs doesn’t make walking away from three years of capital expenditure any easier emotionally.
The useful question is not, “Which biases do I know about?” It is:
“How can I make it harder for my biases to control an important commercial decision?”
1. Confirmation Bias: Looking for Reasons You’re Right
Once you have formed a view, it is natural to notice evidence that supports it.
Imagine you’ve decided that a new product or service will succeed. Customer comments supporting the concept suddenly seem profoundly significant. Objections are quickly explained away: perhaps those customers aren’t the true target market, don’t understand the proposition, or haven’t seen its full potential. You end up conducting plenty of research without genuinely testing your conclusion.
A stronger approach is to deliberately hunt for evidence that would change your mind:
- Ask what would have to be true for your current conclusion to be wrong.
- In a leadership meeting, appoint a team member to act as a red team to challenge the preferred case rather than defend it.
The objective isn’t negativity; it is rigorous testing.
2. Sunk Costs: Yesterday’s Investment vs. Tomorrow’s Value
The more you have invested in something, the harder it becomes to walk away.
That investment might be capital, but it can also be time, personal reputation, or emotional commitment. Abandoning the project can feel like an admission of failure. But the money and time are already gone. The only useful decision concerns what happens next.
Apply this simple commercial test:
“If I hadn’t already invested a penny or an hour in this, knowing what I know today, would I choose to start it now?”
That doesn’t mean persistence is wrong. Many worthwhile ventures require persistence through difficult periods. The distinction is between persisting because the future business case remains robust, versus persisting because acknowledging past loss is painful.
3. Anchoring: The First Number Changes the Conversation
Anchoring is particularly visible in pricing, procurement, and commercial negotiations.
The first credible number introduced becomes a magnetic reference point. Once it enters the room, subsequent thinking clusters around it. You may believe you are independently assessing value, but you are often merely negotiating how far above or below the anchor you should land.
Anchors aren’t limited to figures. A first forecast, an initial strategy paper, or an early description of an organisational problem can frame everything that follows.
Before adjusting from an anchor, question its origin: What would your assessment have been if you had never seen that initial number?
4. Dunning-Kruger: Confidence Travelling Further Than Competence
The Dunning-Kruger effect is often trivialised as “incompetent people think they are brilliant.” That isn’t the useful lesson for senior executives.
The real problem is that limited knowledge in an unfamiliar area makes it difficult to appreciate what you don’t yet understand.
This matters immensely for experienced people. Expertise in corporate operations does not automatically transfer to a new software architecture, an unfamiliar culture, or a new market. General confidence outpaces specific competence.
The response isn’t to doubt your general ability. It is to recognise when you have crossed into territory where domain specialists can reveal the critical questions you don’t even know to ask.
5. Availability: Memorable Doesn’t Mean Typical
A dramatic story is easier to remember than a complex spreadsheet. What comes easily to mind feels far more common and significant than it really is.
A recent operational failure, a vivid competitor success story, or a striking headline can distort strategic priorities far beyond what empirical data supports. Case studies are useful, but the error lies in treating an easily recalled anecdote as an underlying commercial pattern. When an example feels compelling, demand the broader statistical distribution.
6. Black-and-White Thinking: Where Did the Other Choices Go?
Complex business dilemmas frequently get reduced to artificial binaries:
- Do we launch or cancel?
- Do we keep the executive or dismiss them?
- Do we accept the supplier’s proposal or walk away?
Sometimes there genuinely are only two options. Often, there are several.
A useful executive discipline is to refuse the binary. If the apparent choice is A or B, require your team to construct options C and D before making the final call. Those alternatives may ultimately be discarded, but creating them reveals how constraining the initial framing was on your options.
From Awareness to Better Decisions
| Decision-Making Bias | What Can It Make You Do? | A Practical Challenge |
| Confirmation Bias | Favour evidence supporting your existing view | Deliberately seek credible counter-evidence |
| Sunk Cost Fallacy | Continue a failing project due to past spend | Ask whether you would invest to start it today |
| Anchoring | Judge value relative to the first reference point | Make an independent assessment before reviewing the anchor |
| Dunning-Kruger | Project confidence into unfamiliar domains | Seek domain experts to identify unknown blind spots |
| Availability Heuristic | Overweight vivid, recent, or emotional examples | Compare the memorable story against baseline data |
| Black-and-White Thinking | Artificially reduce a complex problem to two choices | Force the creation of at least two viable alternative options |
You do not defeat decision-making biases with intentions to “be more rational next time.” You defeat them by building practical friction into your decision process: pre-mortems, independent estimates, explicit exit criteria, and designated dissenters.
The Question
Please post your answer in the YouTube comments.
Where might you be letting past investment, an initial anchor, or a binary choice force a decision that deserves a proper challenge?
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Action: Book your initial 30-minute secure video session now.
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Decision-Making Biases: FAQs
Q: How do decision-making biases distort commercial decisions?
A: Decision-making biases direct your attention toward data, customer feedback, and metrics that validate your hypothesis while filtering out warning signs. To counter it, actively task team members with building a credible case against the proposal.
Q: How do you separate sunk costs from sensible persistence?
A: Sensible persistence evaluates expected future return relative to future cost and risk. Sunk cost thinking fixates on past investment that cannot be recovered. If you would not greenlight the project today as a new initiative, continuing it is sunk-cost rationalisation.
Q: Why is the Dunning-Kruger effect dangerous for seasoned executives?
A: Experienced leaders often mistake broad commercial confidence for deep technical or domain expertise. Entering new sectors, AI initiatives, or unfamiliar regulatory environments without recognising the limits of your knowledge leads to high-confidence strategic errors.
Q: What is the most reliable way to neutralise decision-making biases?
A: Build structural friction into your governance. Instead of relying on personal objectivity, implement formal pre-mortems, establish non-negotiable exit metrics before committing capital, and systematically reject binary choices by demanding alternatives.
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