The purpose of this act is to:

(a) Protect policyholders and the public against the adverse effects of excessive, inadequate or unfairly discriminatory rates;

(b) encourage, as the most effective way to produce rates that conform to the standards of paragraph (a), independent action by and reasonable price competition among insurers;

(c) provide formal regulatory controls for use if independent action and price competition fail;

(d) authorize cooperative action among insurers in the rate making process, and to regulate such cooperation in order to prevent practices that tend to bring about monopoly or to lessen or destroy competition;

(e) encourage the most efficient and economic marketing practices; and

(f) regulate the business of insurance in a manner that will preclude application of federal antitrust laws.