Tetradic Solutions has been making purchases from Ribbon, Inc., for the last three years. Every three months, it makes the same order of 5,000 ml of Ribbon, Inc.'s, secret compound used in Tetradic's lotion line. Recently, Tetradic has seen a downturn in demand and needs to alter its usual order from 5,000 to 3,500 and hopefully reduce the price per ml. What BEST describes Tetradic's situation