Fast-growing companies almost always see their growth rate decline as they get larger. The pattern is so consistent that its absence is more remarkable than its presence.
The same rate requires more each year
Doubling a small revenue base requires a modest absolute amount of new business, and doubling a large one requires a great deal more.
A company maintaining a constant percentage must therefore add progressively larger amounts, which usually means finding more customers than the previous year did.
The rate falling is consistent with the business adding more absolute revenue than ever before, which is why rate and progress can move in opposite directions.
The easiest customers are acquired first
Early customers are those with the strongest need and the least resistance, and they are naturally reached first.
Later customers are further from that description and require more persuasion, longer cycles or additional product capability.
So the cost of acquiring each additional customer rises for reasons unconnected to how well the marketing is being done.
Retention becomes a larger part of the arithmetic
At a small size, losses are trivial in absolute terms and easily covered by new business.
At a larger size, the same percentage of loss represents a substantial amount of revenue that must be replaced before any growth is recorded.
This is why mature companies invest heavily in retention while young ones can reasonably ignore it, and why the transition catches teams out.
Market size sets an eventual limit
Every market contains a finite number of buyers, and growth rates decline as the addressable portion of that market is consumed.
Companies approaching that point must either expand what they sell, expand who they sell to, or accept the slower rate.
Recognising which constraint applies matters, since a company that is running out of market will not fix it by hiring more sales staff.
The distinction is visible in where deals are lost. Losing to competitors indicates a market that still has room, while finding no qualified buyers at all indicates the boundary has been reached.
Internal complexity absorbs part of the growth
Larger organisations spend more effort on coordination, and the proportion of total effort reaching the customer falls as headcount rises.
Some of that overhead is necessary and some is the accumulated residue of processes added in response to past problems.
Companies that periodically remove the second kind recover capacity that would otherwise be counted as an unavoidable cost of scale.