This domination started to change in the 1960s. There was growing criticism of the health profession. Errors in diagnosis, wrong procedures, misinforming patients, and failure of peer networks to report poor practice, etc. started gaining attention. This happens because of information asymmetry: situations where one party to a transaction has more or better information than the other. Due to the complexity and uncertainty of medical treatment, patients were unable to evaluate the quality of service being provided. In turn, doctors exercised undue influence over patients. Some common problems with doctors, like unnecessary tests, operations and prescriptions are explained by this theory.