The 80/20 rule in growth marketing: use it to cut, not to focus
In 1896, an Italian economist sat down with property records and found that about 20% of the population owned about 80% of the land.
Vilfredo Pareto was not running a business. He was studying how wealth was spread in Italy. Nobody asked him to invent a management framework.
That is the part everyone skips when they quote "80/20" in a meeting. It was not a business theory. It was an observation about how unevenly outcomes are spread, and it keeps showing up wherever anyone checks: campaigns, customers, products, creatives.
The exact split is rarely 80/20. Sometimes it is 90/10, sometimes 70/30. The point is that effort and outcome are not proportional.
Where most explanations stop
Most explanations end at "focus on the 20%." That is where the decision-making should start.
Don't assume you know your 20%. Verify it.
I do not take "our top channel is X" at face value until I have pulled the real numbers. The two most common wrong guesses are the loudest channel and the newest customer segment. Visibility gets mistaken for value, almost always.
Check it again next quarter.
The 20% moves. Creative fatigues, competitors enter an auction, a platform changes its algorithm. A ratio confirmed in Q1 is not confirmed in Q3.
Use it to cut.
Here is the part nobody wants to hear: the rule is not there to tell you what to focus on. It is there to tell you what to cut.
Focusing is free. Everyone agrees to focus. Cutting is the decision that costs you something, which is why it works.
What to count
- Campaigns and ad sets: which ones produce most of your profitable conversions?
- Creatives: which few assets bring users who still pay at day 60?
- Customers: which segments produce most of your revenue and retention?
- Channels: which ones still move total revenue when you test pausing them?
- Features or SKUs: which ones do your retained users actually use or buy?
The move
- Pick one list (campaigns, creatives, customers or channels) and sort it by profit, not by volume.
- Find the cut-off where the top items make up most of the result.
- Verify the top with an independent check, such as a holdout or a cohort read, before you trust it.
- Cut or sharply reduce the long tail, even the parts that are still technically working.
- Repeat next quarter.
Bottom line
Pareto counted land deeds. Count your own version: campaigns, customers, creatives. Then cut the 80% that is still technically working.
FAQ
What is the 80/20 rule in marketing?
It is the observation that a small share of inputs, such as campaigns, customers or creatives, usually produces most of the results. The exact ratio varies, but outcomes are almost always uneven.
How do I find my top 20% of campaigns?
Sort campaigns by profit or by revenue from retained users, not by installs or clicks. Then confirm the top performers with an independent check, such as a holdout test or a later cohort read.
Should I cut campaigns that are still profitable?
Often, yes, if they sit in the long tail. Budget and attention spent on marginal campaigns could go to the few that drive most of the result. The rule is most useful as a guide to what to cut.
How often should I recheck my 80/20 split?
Every quarter. Creative fatigue, competition and platform changes move the top performers over time.