The two percent combines two well-known project management concepts.
In any project, the hardest thing is to start. People get stopped by procrastination and analysis paralysis.
Then next is to stop. People can always add just one more improvement. It’s not always easy to know what the stopping point is, though.
Then, there is the 80/20 rule. About 80% of the work will be done by 20% of the people. About 20% will start, about 20% of those will finish or about 4%, and maybe half of those will be successful for your 2%, if we are lucky. Staying with the rule, the 2% estimate is a little high.
Excellent article for explaining the concept without the math.