Through finding the balance between investment in inventory and service levels, businesses can exploit the laws of Pareto principle in order to adopt a more proactive approach to managing the entire assortment. It is no secret that for many businesses, 80% of the turnover is generated by just 20% of the assortment. Given that such a large proportion of the assortment seemingly offers such little value to the business, you would be forgiven for focusing all of your attention on the best performing lines. However, inventory decisions should not be taken lightly and businesses should strive to manage their entire assortment as effectively as possible.