The 80/20 rule is the key principle to remember when you think of "heavy users" even though exact figures vary with each product and product category.

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The statement is true. The 80/20 rule states that 80% of effects come from 20% of causes, and is often applied to heavy users of products or services. However, the specific percentages may vary depending on the product or industry.

The 80/20 Rule Is the Key Principle to Remember When