Missouri Revised Statutes Title XVIII. Labor and Industrial Relations § 287.952. Rate standards in noncompetitive market, factors

(1) Due consideration may be given to past and prospective loss and expense experience within and outside of this state, to catastrophe hazards and contingencies, to events or trends within and outside of this state, to loadings for leveling premium rates over time, for dividends or savings to be allowed or returned by insurers to their policyholders, members or subscribers, and to all other relevant factors, including judgment;

(2) The expense provisions included in the rates to be used by an insurer shall reflect the operating methods of the insurer and, so far as it is credible, its own actual and anticipated expense experience;

(3) The rates may contain provisions for contingencies and an allowance permitting a reasonable profit. In determining the reasonableness of profit, consideration should be given to all investment income attributable to premiums and the reserves associated with those premiums.