The spot market is the primary driver in determining supplier postings at the rack. The spot market establishes suppliers’ replacement costs for product. That cost is then used to set the price at the terminal for products that will be lifted by tanker trucks the subsequent day, and sold at retail outlets over the next few days. This market design has built in the replacement cost factor, which is the way commodities are valued. In other words, a supplier will set their price at the rack for the following day, or even later that same day, based on what it would cost in real-time to replenish the gallons he or she is selling now.