Natalie Striegle, the president of Somers Company, is pleased. Somers substantially increased its net income in 2008 while keeping the number of units in its inventory relatively the same. Stefan Skopek, chief accountant, cautions Striegle, however. Skopek says that since Somers changed its method of inventory valuation, there is a consistency problem it would be difficult to determine if Somers is better off. Is Skopek correct? Why?