The **Pareto principle** (also known as the **80–20 rule**) states that, for many events, roughly 80% of the effects come from 20% of the causes.

*What? Hold on a second, you mean that 20% of our efforts gives us 80% of our success?*

*How we came up with that?*

Business-management consultant Joseph M. Juran suggested the principle and named it after Italian economist Vilfredo Pareto, who observed in 1906 that 80% of the land in Italy was owned by 20% of the population; he developed the principle by observing that 20% of the pea pods in his garden contained 80% of the peas.

In business; e.g., “80% of your sales come from 20% of your clients”. Mathematically, where something is shared among a sufficiently large set of participants, there must be a number *k* between 50 and 100 such that “*k*% is taken by (100 − *k*)% of the participants”. The number *k* may vary from 50 (in the case of equal distribution, i.e. 100% of the population have equal shares) to nearly 100 (when a tiny number of participants account for almost all of the resource). There is nothing special about the number 80% mathematically, but many real systems have *k* somewhere around this region of intermediate imbalance in distribution

*Where you can find the Pareto principle?*

Almost everywhere.

Whenever you try something new the 20% of your effort wiil give you the 80% of the final outcome!

*How I can use this?*

It depends! For example, some experts say that in a business ,since 20% of the people produce 80% of the results, you should focus your time on managing that 20%.Despite that you are never sure what this 20% represents and finally what happens if this 20% change. In a personal scale you should focus in the 20% of your limited time that produce more of your results.If you are a student, this is huge.

*In conclusion*

Spend your precious 20% efficiently !