Abstract: A modular point-of-purchase display system is provided with a base in which open-fronted trays are inserted, and an alternative base in which open-fronted trays are stacked onto a base having an inclined, L-shaped profile, when observed from the side, the trays being wider than the base surface upon which they rest. Vertical extensions are provided, for increasing the stacking capacity of each of the bases. Two tray sizes are provided, ones having a shallow depth, and ones having substantially greater depth. Front extensions are provided for the bases, in both modes, for accommodating trays having substantially greater depth. Trays are provided with interior wall components that enable the user to select between several alternative tray interior configurations, to accommodate products being displayed, products having different dimensions, and to accommodate products having different row and/or stack counts.