Prevent Out-of-Stock and Empty Aisles to Delight Your Shoppers As per a Harvard Business Review report, if shoppers fail to find a product that they are looking for, 7% to 25% of them will not replace it with a substitute and around 21% to 43% of them will go to another store to buy the item. Now this clearly negates the section of retailers who believe that shoppers will pick an alternate product from the same category if they fail to find the intended product. And due to intense competition, retailers also must ensure proper product spread and relevant inventory to prevent empty aisles.