-(i) The optimal solution: Sections 2.1.1 and 2.1.2 in this paper reveal that the optimal solution (Q∗, S∗) for Model (I) and (II) by using our approach are consistent with those by using the algebraic approach of Sphicas [13]. -Sphicas [13] indicates that if √2KDh < πD <√2KD(h + p), Johnson and Montgomery [12] cannot obtain the optimal solution since S∗ < 0. This is a shortcoming of Johnson and Montgomery [12]. -However, our approach complements the shortcoming of Johnson and Montgomery [12] and obtains the same optimal solutions as those of Sphicas [13] in a formal mathematical way.
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