This study points out that there is a limit to apply the path - dependent model to formal policy, especially regulation, and suggests a new analysis framework to explain the fixation phenomenon of regulation and to prove this through the case of segregation of silver. In the case of formal institutions such as regulation, it is not chosen by chance, but is formally adopted. Regulation once adopted is a target of regulation, which tends to regard regulatory revision as the abandonment of regulatory objectives. In the regulatory framework, the parties who have already entered are guaranteed profits, and the bureaucratic state maintenance and control tendencies are reflected. It is because of this mechanism that the formal system of regulation continues with a certain path. The regulation on Separation system of banks and industries is an example adopted to demonstrate the validity of this new framework. Why has the Korean standard for Separation system of banks and industries been kept constantly 4/100? This is because Korea has been unable to reflect the rapid changes in the financial industry, including banks, over the past 30 years. In addition, despite the changing regulatory environment, it can be assumed that regulatory norms due to uniformity and rigidity are likely to occur if the regulatory standards are kept at a certain level for such a long period of time. As confirmed in the actual case analysis, the competitiveness of Korea's banking business is a barriers to entry due to the segregation of silver, and the challenges such as the development of new businesses are less competitive than those of competitors. This is because, unlike the path dependence of the informal system, which is the result of voluntary adaptation and selection such as the privatization of the private sector, the adherence of the formal system of policies and regulations to a particular path is a result of the confluence of system and environment.