The 80/20 rule is an important one in business. Also know as the Pareto principle, the 80/20 rule states that 80% of your sales will come from 20% of your customers.
This rule can be applied to any manor of businesses. In the affiliate marketing world, 80% of your profit might come from 20% of your merchants, or 20% of your websites. In freelance web development, 80% of your revenue might come from 20% of your clients.
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