Answer:
The Pareto principle
Step-by-step explanation:
The Pareto principle asserts that 80 percent of the results come from 20 percent of the course. The principle was named after Pareto, an Italian economist, who first observed this phenomenon. The Pareto principle is not a law but an observation.
Some other examples that Pereto observed include
20% of the features make 80% of the usage
20% of the employees produce 80% of the result
20% of the clients create 80% of the revenue