According with the exponential growth of Information Technology and current volatility world, the company has to drive uncertainty much rather than before. This is the time that keeping still shall result in termination of company. Therefore it is important to clarify the priority evaluation measure for continuing company operation, which we will define the vital power scale in this paper. Focusing working capital (Cash enable company to do legal payment to any stakeholders), which is essential to maintain company operation, evaluation measure for vital power of company (major measurable factor to evaluate working capital or practical measurable index for corporate management, corporate management is to enable to keep company alive) has been studied with TOC (Theory of constraints). Investigation has been done by using dice simulation having assumption of linkage and fluctuation in system, which is introduced by TOC, under the variable market price and varying company productivity.