Give or take, most web actions and results work out at 80/20 and this simply means 80% of your results (effects) will come from 20% of your actions, products or processes (causes).
As an example, you will find approximately 80% of your sales come from 20% of your product range and 80% of customer service issues will come from 20% of your products, etc.
Once you have data to work with you can start a ‘Best Sellers’ page and promote your top sellers. You can automate and extract your top selling products and display these on the live site. Apply this where you can throughout your ecommerce business and it will help efficiency, productivity, sales and profits.