The term relating to Store Inventory Management SIM. Staple merchandise meaning the merchandise in fashion. The retailers maximise their profits through Staple merchandise. These sorts of products rarely require markdowns for disposal at the end of a season because these products carry through from season to season. The term Staple merchandise is , so to say, relating to the term Model Stock of retail biz, which means maintaining a necessary assortments of products or product mix to satisfy customers' needs.