“…However, Ding, Chen, Wu, and Wei (2018) thought the achievement of a common technological level by all DMUs is impractical and thus presented a new approach that accounts for technological heterogeneity. Most of studies mentioned above regarded the fixed cost as a new input for the DMUs, but Li, Yang, Liang, and Hua (2009), Lin and Chen (2017) allocated fixed cost as a complement of other cost inputs on the basis of DEA approach, and this method was extended to two-stage systems by Zhu, Zhang, and Wang (2019). Zhang, Wang, Qi, and Wu (2018) combined game theory and DEA approach to solve the problem of transmission cost allocation.…”