Supermarkets always display only a fraction of the available assortment. In the field of tension between sales, rotation, margin, unit benefits, advertising allowances and promotions, merchants decide every day which products make it onto the shelf and which disappear again. However, the depth of the assortment is an important differentiating feature that gives independent retailers in particular a profile and sets them apart from chain stores and discount stores. Assortment work is always a compromise, however, as shelf space is limited and other assortments can only be offered in a reduced or shortened form. The most obvious of all solutions - creating more shelf space - is usually not an option. However, with technical support, shelves - and thus item placements - can be extended, virtually or physically. The hurdles are usually user acceptance and the form of fulfillment, which deals with how decentrally stored items end up in the customer's shopping cart.