“…Specifically, Tien et al (2008) provided an integrated decision-making method (i.e., the optimal allocation decision) relative to the decision-making in respect of environmental investment levels and found that enterprise sales and profits responded better to the optimal allocation than to the allocation by ratio. Furthermore, increasing the consumers' recognition and approval of environmental investment, environmental investment efficiency, and production efficiency will be conducive to enhancing the environmental investment level (Tien et al, 2008).…”