The Gap Between Knowing And Doing
Most investors do not lack knowledge.
They understand the importance of diversification. They know not to chase rising prices. They recognise the risks of holding onto losses for too long. They have read the books, followed the commentary, and, in many cases, experienced the consequences of poor decisions more than once.
And yet, a plan that felt clear in advance becomes harder to follow when the moment arrives to put it into action. A decision that seemed obvious in theory becomes less certain in practice. The distance between intention and action, which appeared small on paper, begins to widen.
What’s Really Going On?
It is tempting to think of this as a discipline problem. A failure to follow rules. A lack of consistency or willpower, and while those elements can play a role, they do not fully explain what is happening. The gap between knowing and doing emerges from the way decisions are made in real environments, not ideal ones.
Plans are typically formed in calm conditions, with time to think, space to reflect, and the benefit of distance from immediate consequences. Decisions, on the other hand, are made in real time. Prices are moving. Information is incomplete. Outcomes are uncertain. There is often a sense that action is required, even if the situation is not fully understood. Under these conditions, the mind does not simply retrieve a plan and execute it. It begins to reinterpret it.
The Pattern Beneath the Surface
As pressure increases, several subtle shifts tend to occur. Attention narrows. Certain pieces of information become more prominent, while others fade into the background. Recent events carry more weight than earlier analysis. Alternative perspectives are considered, but often with the aim of confirming an existing position rather than challenging it.
At the same time, internal narratives begin to form. Small adjustments to the original plan are framed as reasonable and temporary. A delay becomes patience. A deviation becomes flexibility. Each step feels justified in isolation, even if it gradually moves further away from the initial intention. These changes rarely feel like a clear break from the plan. They feel like minor refinements, made in response to evolving conditions.
Why This Matters in Markets
When this pattern is repeated across many participants, it begins to influence market behaviour.
Investors who intend to act at certain levels hesitate as those levels are reached. Buying becomes more aggressive as prices rise, not because valuations improve, but because confidence builds with momentum. Selling is delayed during declines, as the desire to avoid realising losses encourages waiting.
The result is a tendency for markets to drift away from equilibrium. Moves extend further than expected, not solely because of new information, but because behaviour adapts in real time. What appears to be a change in outlook is often a change in execution.
Where You Will See This in Yourself
You may notice this gap in small but familiar moments. A decision to exit a position is delayed, not because the original reasoning has changed, but because the current price feels uncomfortable. A rule to rebalance is postponed while waiting for “a better moment.” A limit that was set in advance is quietly adjusted once it comes into view.
There can also be a tendency to seek reassurance before acting. Additional opinions are gathered, not to improve the decision, but to reduce the discomfort associated with making it.
None of these actions feel unreasonable on their own. They are part of a gradual shift that only becomes visible when viewed as a whole.
Connection to the 12 Temptations
This gap is where many of the Temptations take hold, with each one representing a point at which behaviour begins to drift away from intention. The shift is rarely abrupt. It unfolds through small adjustments, each of which feels justified at the time. Over time, these adjustments accumulate, and the original plan becomes difficult to recognise.
Understanding this process does not eliminate the gap. It does, however, make it easier to notice when it begins to open.
Most plans do not fail at the point they are created. They fail in the moment they are tested. And that moment rarely announces itself in advance.
This topic draws on research in behavioural finance, self-control, and decision-making under pressure, including work on time inconsistency, cognitive load, and the intention–action gap.