Surface the Beliefs Your Investment View Depends On | Sekvarenkon Insights

Thinking tools for the private investor

Every investment view is built on a foundation of beliefs, and the tricky part is that most of those beliefs are invisible to the person holding them. When someone decides that a particular company looks attractive, they are not simply responding to the numbers in front of them. They are filtering those numbers through a set of assumptions about how the economy behaves, how management teams make decisions, how competitors will respond, and how customers will change their habits over time. None of those assumptions are printed in an annual report. They live in the investor's head, shaped by experience, by things they have read, and sometimes by nothing more than a general feeling that the world works a certain way. The problem is not that assumptions exist — every view requires them — but that unexamined assumptions are impossible to test, and untestable beliefs have a way of surviving long after the evidence has moved against them. Making your assumptions visible is therefore not a philosophical exercise. It is a practical discipline that changes how you hold a position and how quickly you recognise when it is time to reconsider.

A useful way to begin is to write out your investment thesis as a chain of conditional statements rather than a single conclusion. Instead of noting that a business looks undervalued, try to articulate the sequence of things that would have to be true for that conclusion to hold. You might find yourself writing something like: this company grows its revenues only if consumer spending in its core market holds up, which depends on employment remaining broadly stable, which in turn depends on interest rates not rising sharply enough to suppress discretionary purchases. Each link in that chain is an assumption, and each one can be examined on its own terms. Some will be well-supported by publicly available information. Others will turn out to be little more than hope dressed up as analysis. The discipline of writing the chain down forces you to notice the difference. It also reveals which assumptions are doing the most work — the ones where, if you are wrong, the whole thesis collapses — and those are precisely the beliefs that deserve the most scrutiny before you commit to anything.

Once you have identified your key assumptions, the next step is to stress-test them by imagining scenarios in which they are wrong. This is not pessimism for its own sake. It is a structured way of understanding the range of outcomes that are genuinely possible rather than just the outcome you are hoping for. For each critical assumption, ask yourself what evidence would cause you to revise it, and whether that evidence is the kind of thing you could realistically monitor over time. If an assumption rests on a trend that is already well-established, consider how many other investors are likely to have made the same assumption, and what that means for how much of the expected outcome might already be reflected in the current price. If an assumption depends on something genuinely uncertain — a regulatory decision, a shift in technology, a change in consumer behaviour — be honest about the fact that you are making a judgement under uncertainty rather than drawing a conclusion from established fact. Investors who conflate the two tend to become overconfident in their positions and underreact when early warning signs appear.

The deeper value of surfacing your assumptions is not just that it makes you a more careful analyst in the moment. It builds a record of your thinking that you can return to later. When a position moves against you, the natural human response is to search for reasons why the original thesis still holds, a tendency that researchers who study decision-making have long recognised as one of the most persistent sources of poor judgement. Having a written record of the specific beliefs your thesis depended on gives you an objective reference point. You can ask whether the thesis has been contradicted by events or whether the market has simply moved in a way that does not yet reflect the underlying logic you identified. Those are very different situations, and conflating them is expensive. Keeping a simple investment journal — nothing elaborate, just a clear statement of what you believed and why at the time you formed a view — turns each position into a learning opportunity regardless of how it resolves. Over time, patterns emerge: you begin to notice which categories of assumption you consistently get right, which you consistently misjudge, and where your thinking tends to be genuinely original versus where you are simply echoing the consensus without realising it.