80/20 Rule aka Pareto Law

80/20 rule is “universal truth” about the imbalance of inputs and outputs ,also known as Pareto Law.

80/20 Rule: “20% of efforts will convert into 80% of the results.”

Focus on 20% only. Don’t care for 80%.If you did 20% best then the rest 80% will definately be great.

Although the 80–20 axiom is frequently used in business and economics, you can apply the concept to any field — such as managing time, wealth distribution, personal finance, spending habits, and even infidelity in personal relationships.
If you’ve studied business or economics, you’re well familiar with the power of the Pareto Principle. But if you have not then you’ll be familiar with Pareto Principle within a moment.

Well the man behind the concept is Vilfredo Federico Damaso Pareto and the fact what hits him was:

He noticed that 20% of the pea plants in his garden generated 80% of the healthy pea pods. This observation caused him to think about uneven distribution. He thought about wealth and discovered that 80% of the land in Italy was owned by just 20% of the population. He investigated different industries and found that 80% of production typically came from just 20% of the companies. The generalization became 80/20 rule.