Abstract: Manager seldom shows completely rational when giving investment decision of a certain operation system. In this paper, two types of manger, who are risk-neutral and loss-aversion respectively when deciding an operation system's capacity structure which is a mixture of flexible and dedicated operational capacity are reinvestigated. Furthermore, the investment decision is considered when operation system might face an sudden fluctuated external demand, with a characteristic of drifting-upwards mean and extended/converged variance. A basic and extended newsvendor model is presented to compare the different decision of different managers mentioned above, and mathematic proofs are also presented as well. Results indicated that, under the influence of some critical parameters, which are the probability and distribution parameters of sudden disturbance on demand, the expansion ration of flexible capacity in different scenarios, the investment decision on flexible capacity make by a risk-neutral manager is rather different when compared to a loss-aversion one. Lastly, subsidy or penalty based on the amplitude of underage cost could mitigate the flexible capacity investment decision gap when manager present loss-aversion.

Key words: unexpected disturbance, loss-aversion, investment on capacity structure, flexibility