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"The following excerpt is from Perry Marshall, Mike Rhodes and Bryan Todd’s book Ultimate Guide to Google AdWords. Buy it now from Amazon | Barnes &amp; Noble | iTunes| IndieBound The 80/20 Rule, aka the Pareto Principle, says: 80 percent of what you get comes from 20 percent of that you do: small effort, big reward. 20 percent of what you get comes from the other 80 percent that you do: Big effort, small reward. 80/20 applies to just about everything you can measure in a business. Sources of inco..."
<https://www.dbmsglobal.com/post/2018/01/10/what-you-really-need-to-know-about-marketings-8020-principle-to-succeed>