sentences:  Pallet flow racking systems are either a FIFO (first in, first out) or a LIFO (last in, first out) storage system.If the system is loaded from the back and unloaded from the front, it is FIFO; if the system is loaded and unloaded from the front it is a LIFO system.Mobilized storage system has helped many organizations reduce or eliminate new building construction costs, auxiliary warehouses, building expansions, and decrease ongoing operational costs (lighting, energy, insurance) by redistributing the use of their storage floor space.