Abstract Society has built institutions to face various problems in each area of our lives. Yet, institutions face considerable problems in fulfilling their objectives in a continuously changing world. With this in mind, the present study starts from the institutional resistance to change and searches for ways to improve efficiency and increase the positive impact on social welfare. For this, we start by looking at the competition authorities as new institutions and we study how they work and the role of communication, learning, and transparency in increasing institutional efficiency and receiving social legitimacy. The paper begins with a mixed theoretical approach to institutional change and focuses on the role of legitimacy in stimulating institutional change, and the type of institutional change for increasing efficiency. The research ends with the Romanian case study which shows the necessary aspects for making the institutional change real.