The claim
A prospect has to encounter your business seven times before they will buy. It is the assumption underneath most nurture sequences, most drip campaigns and a good share of retargeting spend.
The origin story, and why it falls apart
The version everybody repeats is that Hollywood studios in the 1930s found a filmgoer needed to see a poster seven times before buying a ticket.
Press on it and there is nothing there. No studio memo, no agency research, no trade journal from the period that establishes the figure. The sources we read agree on this point, including ones that go on to recommend the rule anyway.
Two things make it worse rather than better. Earlier advertising authorities put the number at twenty, not seven. And when actual research into effective frequency finally arrived, it landed on three.
So the number has moved from twenty to seven to three depending on who was talking, which is the signature of an assertion rather than a measurement.
The deeper problem: it counts the wrong thing
Even taken at face value, a touchpoint count cannot tell the difference between seven encounters that built on each other and seven that each started from nothing. A customer who reads your roof replacement guide, then your cost page, then your reviews has done something completely different from one who saw the same Facebook advert seven times.
The metric treats those as identical. That is why sequences built on it tend to keep firing at people who were never going anywhere while doing nothing extra for the ones who were.
What to do instead
For a trade business the useful question is not how many touches but which ones, and in what order. The pattern we see repeatedly: somebody searches a problem, reads a page that explains it properly, looks for evidence you have done it before, and then rings. Three things, not seven, and each doing a different job.
Build for that sequence. A page that answers the question, proof that it is not your first time, and a phone number that gets answered. Then measure how many enquiries actually arrive rather than how many touches you managed to deliver.
Questions
So how many touchpoints does it take?
Nobody can tell you, because it depends on the job value, the urgency and how many other firms the customer contacted. A burst pipe is one touch. A conservatory is a fortnight of reading. Any single number applied across both is decoration.
Should we stop doing follow-up sequences?
No. Following up works, and most trade businesses do far too little of it rather than too much. The argument here is against the specific number, not against the practice. Follow up until the person tells you where they got to, and stop counting.
Where did the number three come from?
From research into effective frequency in advertising, which concluded that three exposures were enough for the effect being measured. That is a real finding about a specific thing, and it is also not a rule about how many emails to send a roofing customer. It is quoted here to show the number has never been settled, not to replace one folk figure with another.