20% of the people in an organization, typically do 80% of the work.
This also applies when you look at roles separated into labor and management. When you only have 20% functioning competently in a all population you have a lot of problems.
The way organizations deal with this is through procedural rules. Though, it does seem that a lot of people have reading comprehension problems, so a lot o those rules are misapplied somewhere. Or they get ignored. And you know it happens more often than not, unless there are serious checks and balances in place.