Every decision was the right one
Nobody decided to stop being able to reach people. It just happened, one sensible year at a time.
You have defended that spend every year, and the numbers supported you. They still do. This briefing does not argue with your performance data - it accepts it, and then asks something the data was never built to answer: what can the sales team still do? Not your team, and not your remit - but you are measured on what they close, which makes the state of that capability your concern whether or not it is your responsibility.
Further reading
Repeated allocation to a performing channel builds competence in that channel, which improves its results, which justifies further allocation.
Every step is defensible on the evidence available at the time. The loop is self-reinforcing and produces no signal that any capability is being lost.
Foresight does not prevent it and testing does not catch it. Someone doing all of it right still ends up preferring what pays back immediately over what pays back with practice - even when the two are worth exactly the same. That condition is the part doing the real work: you can accept every figure your paid search reports and still act on this. They are two different questions - what a channel returns, and what the business could do without it.
The 1988 definition, verbatim:
favorable performance with an inferior procedure leads an organization to accumulate more experience with it, thus keeping experience with a superior procedure inadequate to make it rewarding to use
Note the mechanism is about accumulated experience, not about the merits of either option - which is why no amount of performance data would have surfaced it.
A 2020 revisit of the same trap showed the bias survives a rational, foresighted learner following an optimal exploration strategy, between options of identical expected value. The authors' own summary: selection systems, even optimally designed ones, are biased against late-bloomers.
Sources
- Levitt, B. & March, J. G. (1988). “Organizational Learning.” Annual Review of Sociology, 14, 319-338. Definition at p. 322.
- Denrell, J. & Le Mens, G. (2020). “Revisiting the competency trap.” Industrial and Corporate Change, 29(1), 183-205. Denrell is at Warwick Business School.







