The Commission may investigate and determine, (i) upon its own motion, (ii) at the request of any citizen or any interested party in this Commonwealth, or (iii) at the request of any insurer subject to this chapter, whether rates in this Commonwealth for the classes of insurance to which this chapter applies are excessive, inadequate or unfairly discriminatory or whether loss experience and other factors within the Commonwealth are being properly used to determine the rates. In any such investigation and determination the Commission shall give separate consideration to those factors in the manner specified in § 38.2-1904.