The 80/20 principal (or Pareto Principle as it’s also known by) is the idea that 80% of consequences come from 20% of the causes. This can be applied to the effort you apply to something, or the fact that the top 20% of the population has 80% of the wealth.
Perry Marshall is the guy that applied this concept to business. Essentially, 80% of your revenue comes from 20% of your products. Or 80% of your leads come from 20% of your marketing efforts. In his famous book, 80/20 sales and marketing, he lays out the entrepreneurs guide to sanity. All jokes aside, his whole point is, focus on what really brings in the bacon, spend less time stressed and engaging in random activities.
Here’s Perry Marshall to talk about 80/20 sales and marketing.