M. Nithya     (Department of Mathematics, Queen Mary’s College, Tamil Nadu, Chennai – 600004, India)
C. Sugapriya     (Department of Mathematics, Queen Mary’s College, Tamil Nadu, Chennai – 600004, India)
S. Selvakumar     (Ramanujan Institute for Advanced Study in Mathematics, University of Madras, Chepauk, Chennai – 600005, Tamilnadu, India)
K. Jeganathan     (Ramanujan Institute for Advanced Study in Mathematics, University of Madras, Chepauk, Chennai – 600005, Tamilnadu, India)
T. Harikrishnan     (Department of Mathematics, Guru Nanak College (Autonomous), Tamil Nadu, Chennai – 600042, India)


This paper explores the two-commodity (TC) inventory system in which commodities are classified as major and complementary items. The system allows a customer who has purchased a free product to conduct Bernoulli trials at will. Under the Bernoulli schedule, any entering customer will quickly enter an orbit of infinite capability during the stock-out time of the major item. The arrival of a retrial customer in the system follows a classical retrial policy. These two products' re-ordering process occurs under the \((s, Q)\) and instantaneous ordering policies for the major and complimentary items, respectively. A comprehensive analysis of the retrial queue, including the system's stability and the steady-state distribution of the retrial queue with the stock levels of two commodities, is carried out. The various system operations are measured under the stability condition. Finally, numerical evidence has shown the benefits of the proposed model under different random situations.


Markov process, Compliment item, Infinite orbit, Waiting time

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DOI: http://dx.doi.org/10.15826/umj.2022.1.009

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