A product management display system for merchandising product on a shelf or tray includes using a trackless pusher mechanism that travels along a surface on which product is placed. In one example, the tray or shelf can include a first product retaining member which prevents products from being pushed off of the tray. The pusher mechanism of an exemplary embodiment includes a pusher surface, a second product retaining member, and a pusher floor that extends forward of the pusher surface and between the pusher surface and the second product retaining member. A flat coiled spring or other biasing element may be operatively connected behind the pusher mechanism. In use, the product to be merchandised may be placed on the pusher floor. With this configuration, the pusher surface is prevented from pushing the last product off of the shelf and onto the floor.