“…These studies mainly assume transfer pricing and cost allocation decisions to be vested in a single player, which has convenient implications for management practices. Some studies examine optimal transfer price decisions and cost allocation in integrated supply chains via a non-cooperative game theoretical approach, including competition with rival firms in a product market and conflicts between divisions (Alles and Datar, 1998;Hamamura, 2018Hamamura, , 2019Harris et al, 1982;Matsui, 2011Matsui, , 2012Matsui, , 2013Narayanan and Smith, 2000) [3]. In practice, many firms face product market competition, which affects internal decisions (e.g., transfer pricing, cost allocation).…”