Comments on the "Optimal strategy of deteriorating items with capacity constraints under two-levels of trade credit policy"

This technical note rectified the mathematical and conceptual errors present in Liao et al. (2014). Liao et al. (2014) proposed an EOQ model under two-levels trade credit policy considering limited storage capacity whereby the supplier provides a permissible delay period (M) to the retailer, and the retailer also offers a permissible delay period (N) (whereM > N) to its customers. In the current technical note, we point out some defects of their model from the logical viewpoints of mathematics regarding both interest charged and interest earned. Furthermore, as an example, one of the affected numerical results is re-evaluated.