There is a particular kind of good year that worries me more than a bad one.

Revenue is up eight per cent. Everybody is busy. The team is bigger than it was. Nobody in the business would say anything is wrong, and the founder, when asked, describes it as a solid year of consolidation.

Underneath, the sales cycle has lengthened by six weeks, three of the top ten accounts are being held together by the founder personally, and the last genuinely new logo closed fourteen months ago. Revenue will flatten next year and everybody will be surprised.

They should not be. The stall happened eighteen months earlier. It just did not show up in the only number anybody was watching.

Revenue is a lagging indicator. It tells you about decisions taken a year or more ago, filtered through a pipeline, a delivery cycle and a payment term. If you want warning, you have to watch effort rather than output, because effort moves first.

Here are the ten signals that arrive early, what causes each one, and the specific check that confirms it.

01It costs more to win the same customer

The clearest signal there is, and the one most businesses do not measure because it requires joining two systems together.

The mechanism is simple. When a growth engine reaches its limit, it does not stop producing. It starts producing at a worse price. You keep the same number of wins by working the pipeline harder, discounting slightly more, or accepting slightly worse-fitting customers. The output looks stable. The input has quietly doubled.

The check: take total sales and marketing cost, including the founder's time at a realistic rate, and divide it by new customers won. Compare this year to two years ago. If it has risen more than inflation, you have your answer.

02The sales cycle has lengthened without deals getting bigger

A longer cycle on larger deals is progress. A longer cycle on the same deals is friction.

It usually means one of two things: your proposition has stopped being obviously differentiated, so buyers are shopping around more, or you have started chasing customers who were never going to be a good fit. Both are symptoms of a pipeline that is being stretched to hit a number.

The check: median days from first meeting to signature, by deal size band, for the last three years. Use the median, not the mean, because one enormous slow deal will hide the pattern.

03The founder is back in deals they had stopped working on

This is the one I trust most, because it is impossible to fake and founders always know the answer.

Two years ago you handed over a segment of the pipeline and it kept working. Now you are being pulled back in "just for the important ones", and the definition of important has been expanding. What that tells you is that the sales system was never a system. It was you, with support, and the support has reached its ceiling.

The check: count the deals over the last two quarters that closed without you attending a single meeting. Compare it with the same two quarters two years ago.

If growth requires more of the founder every year, it is not growth. It is you working harder, recorded as a company achievement.

04Your best people have stopped asking for things

Ambitious people ask for budget, headcount, new territories and permission to try things. When they stop, it is not contentment.

It means they have learned that asking does not work, which means they have stopped believing the business is going somewhere. That belief is the thing that produces the discretionary effort growth actually runs on. Its withdrawal precedes resignations by six to twelve months, and precedes revenue effects by longer.

The check: think about the last four significant proposals brought to you by somebody other than a director. When were they, and what happened to them?

05Nothing has been stopped in two years

Growing businesses kill things. Products that did not work, segments that turned out to be unprofitable, processes that made sense at a third of the size.

A business that has not stopped anything is a business that has stopped choosing. Every new initiative is being layered on top of everything that came before, which means resource per initiative is falling, which means everything is being done slightly badly. This one is particularly hard to see from inside because nobody experiences it as a decision.

The check: list what the business stopped doing in the last twenty-four months. If the list is empty, that is the finding.

06Your win rate is holding but your volume is not

This is the distinction between a capacity problem and a demand problem, and getting it wrong sends businesses down expensive dead ends.

If conversion has held steady and total opportunities have flattened, the market is still there and your constraint is on your side of the table: you have run out of ways to generate demand at the top. Businesses in this position often respond by trying to improve conversion, which is already fine, and leave the actual constraint untouched.

The check: opportunities created per quarter, and win rate per quarter, plotted separately for three years. The one that flattened first is your problem.

07Customer concentration is rising and nobody has mentioned it

Concentration rises silently during a stall, because your best accounts keep growing while new ones stop arriving. It is arithmetic rather than strategy, and it is the single most common way a stalled business becomes a fragile one.

The revenue picture can look fine throughout. A business at £6m with two accounts at £1.2m each is in a materially different position from the same business with twenty accounts at £300k, and no revenue line will tell you which one you are.

The check: top five customers as a percentage of revenue, for each of the last four years. If the trend is up, growth has already stalled somewhere else and this is where it surfaced.

08The pipeline is full of deals that will not die

Every stalled business has a pipeline stuffed with opportunities that have been at 60% for nine months.

They persist because removing them would make the forecast look bad, so nobody removes them. Meanwhile the real information, which is that these deals are not moving and the reasons why, never reaches anybody who could act on it. A pipeline that only ever grows is not a pipeline, it is a graveyard with optimistic signage.

The check: the median age of open opportunities. Then apply a rule that anything past twice your normal cycle length is closed out, and look at what is left.

09Recruitment has got harder and you have blamed the market

The labour market is a genuinely difficult place, which makes it a comfortable explanation.

But growing businesses attract people because there is somewhere to go. When a business plateaus, that story becomes harder to tell, and good candidates hear the difference in an interview even when nobody says anything. If your acceptance rate has dropped, or you are increasingly hiring people who are a level below what you wanted, the market may not be the variable that changed.

The check: offer acceptance rate over three years, and how many hires in the last year were the first-choice candidate.

10Nobody can tell you what the next stage looks like

Ask four people in your leadership team, separately, what the business looks like in three years. Do not prompt them.

In a growing business you will get four versions of roughly the same picture. In a stalled one you will get four different pictures, or four descriptions of the present with bigger numbers attached. The second answer is the more revealing, because it means the business has no theory of its own growth. It is running on momentum and calling it a plan.

The check: ask them. It takes an hour and it is the most informative hour you will spend this quarter.

What to do with this

Run all ten as a set, once a quarter, and write the answers down. Individually any one of them has an innocent explanation. Three or more together do not.

The point of watching effort rather than output is that it buys you eighteen months. That is enough time to fix a growth engine. Waiting for the revenue line to flatten leaves you trying to fix it while the number is already falling, in front of a board or a bank that has noticed, which is a much harder place to work from.

The businesses that keep compounding are not the ones that never stall. They are the ones that spot it in the effort numbers, a year and a half before it becomes a story about the market.