Premium rates under a mass merchandising plan shall comply with the standards in the Insurance Law, including the standards that rates not be excessive, inadequate or unfairly discriminatory. Rates shall not be deemed to be unfairly discriminatory because different premiums result for policyholders with like loss exposures but different expense factors, or like expense factors but different loss exposures, so long as the rates reflect the differences with reasonable accuracy. Rates shall not be deemed to be unfairly discriminatory if they are averaged broadly among persons insured under a mass merchandising plan.