From reducing uncertainty to feedback

System control theory and economic analysis concluded that the evidence with each other very well. Feedback control of the implementation of socioeconomic system is the system output in order to achieve a stable result. This can be achieved by negative feedback mechanism. According to the microeconomic evidence, the equilibrium production to achieve profits existed same requirements of insufficient elasticity in the production process. For simplicity, we set up a general model with multiple input factors in short-run equilibrium analysis, for example, the introduction of non-perfectly competitive market structure. At this time, we must consider the market demand changes by the impact of price variations. However, the related elastic analysis gives some market convergence conditions, which will be useful to make economic choices or the system design.