A system for managing and securing product and deterring theft in a retail setting includes a system that resides either on a standard retailer shelf or may be a stand-alone system. In an embodiment, the system includes a plurality of shelves and product dividers positioned between the shelves and extending from the front edges of the shelves toward the rear of the shelves. Front retaining walls are positioned at the front edges of the shelves and are configured to have a height that inhibits access to products on the shelves. Individual retaining tabs of varying height may be added in front of rows of taller product to inhibit access to these products. In an embodiment, rigid or moveable barriers may be positioned above retaining walls that further restrict access to the products. With the invention, the “sweeping” of numerous products by a thief is deterred. In another embodiment, an alert device may be configured to detect and monitor movement of the moveable barriers and may provide an alert signal corresponding to the management of product on the shelf or corresponding to a potential theft situation. In an embodiment, the alert device may communicate with a security camera to monitor the vicinity and provide a notification to the potential thief that his actions are being monitored and recorded, or provide a notification to store computer, pager, cellular telephone, or the like. In yet another embodiment, lock mechanisms may be used to further secure high-risk theft items. Also, clips or clip members may be incorporated to further secure the product dividers to the shelves. In addition, an adjustable power bar may be included that is adjustable to accommodate the height adjustments made to the shelves.