There is a 80:20 rule or how some people call it the "The Pareto Principle" which basically says that 80% of the stuff we do only has 20% impact on our future, income etc, and the other 20% of the stuff we do has an 80% impact on our earnings and future. Shops know that too, they know that 20% of the best selling items bring in 80% of the revenue and the rest 80% of the stuff only bring in 20% revenue, that's why they put the best selling items at the eye level in the shops.
And the same rule...
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