Single factor pricing is the most common pricing method for interstate shipments. The net weight of the shipment is used as the single factor. All of the transportation and packing costs are based on the weight as defined as hundred weight or CWT charge. The single factor rate was instituted in an attempt to simplify pricing for consumers. As a result of the SFR, the traditional a la carte charges for services such as stair carries, long carries, extra labor, etc., are obsolete. All of these charges have been included in the SFR. The single factor was based years of data collected on thousands of moves and represents the average charges for an average 8,000 move.