What is the 80/20 rule?
The 80/20 rule can be applied in many contexts. Casually, it may refer to the observation that often 20% of the effort yields 80% of the benefit and the corollary that the last 20% of the benefit requires 80% of the effort. The 80/20 rule also describes a property that is empirically true of the frequency distribution of many sets, such as 20% of unique words accounting for 80% of words in a book or 20% of companies in a stock portfolio accounting for 80% of the return.
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(Optional) Context information is below.
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Answer the following query.
What is the 80/20 rule?

user
The 80/20 rule can be applied in many contexts. Casually, it may refer to the observation that often 20% of the effort yields 80% of the benefit and the corollary that the last 20% of the benefit requires 80% of the effort. The 80/20 rule also describes a property that is empirically true of the frequency distribution of many sets, such as 20% of unique words accounting for 80% of words in a book or 20% of companies in a stock portfolio accounting for 80% of the return.
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