The aim of the study was to analyze the stability of the financial system to answer the question if this stability has characteristics of the public good. If the answer is positive it determines the specific role of the state in the field of financial system stability. The paper presents also a theoretical aspects of the possibility to qualify the financial system to the category of public goods. The authors conclude that if the stability of the financial system is not in the strict sense the public good (or at least the common good) it should consider the scope and degree of responsibility of the state and its institutions for action aimed at stabilizing financial stability. The arguments presented in the paper demonstrate, however, in favor of the recognition of the stability as a public good. It is therefore a mandate for public sector interventions and interference in such a way as to minimize the risk of destabilization.