Merle Hawkins, the president of Pathway Company, is pleased. Pathway substantially increased its net in- come in 2017 while keeping its unit inventory relatively the same. Jon Dietz, chief accountant, cautions Merle, however. Dietz says that since Pathway changed its method of inventory valuation, there is a consistency problem and it is difficult to determine whether Path- way is better off. Is Dietz correct? Why or why not?